diff --git a/addons/api/addon/models/target.js b/addons/api/addon/models/target.js
index 0e15a8842..0e3f61f7a 100644
--- a/addons/api/addon/models/target.js
+++ b/addons/api/addon/models/target.js
@@ -48,17 +48,21 @@ export default class TargetModel extends GeneratedTargetModel {
   }
 
   /**
-   * An array of resolved credential library instances.  Model instances
+   * An array of resolved credential library and credential instances.  Model instances
    * must already be loaded into the store (this method will not load unloaded
    * instances).  Unresolvable instances are excluded from the array.
-   * @type {[CredentialLibraryModel]}
+   * @type {[CredentialLibraryModel, CredentialModel]}
    */
   @computed('application_credential_source_ids.[]', 'store')
-  get credentialLibraries() {
+  get credentialSources() {
     return this.application_credential_source_ids
-      .map((source) =>
-        this.store.peekRecord('credential-library', source.value)
-      )
+      .map((source) => {
+        if (source.value.startsWith('cred')) {
+          return this.store.peekRecord('credential', source.value);
+        } else {
+          return this.store.peekRecord('credential-library', source.value);
+        }
+      })
       .filter(Boolean);
   }
 
@@ -150,17 +154,17 @@ export default class TargetModel extends GeneratedTargetModel {
   }
 
   /**
-   * Adds credential libraries via the `add-credential-sources` method.
+   * Adds credential sources via the `add-credential-sources` method.
    * See serializer and adapter for more information.
-   * @param {[string]} credentialLibraryIDs
+   * @param {[string]} credentialSourceIDs
    * @param {object} options
    * @param {object} options.adapterOptions
    * @return {Promise}
    */
-  addCredentialSources(credentialLibraryIDs, options = { adapterOptions: {} }) {
+  addCredentialSources(credentialSourceIDs, options = { adapterOptions: {} }) {
     const defaultAdapterOptions = {
       method: 'add-credential-sources',
-      credentialLibraryIDs,
+      credentialSourceIDs,
     };
     // There is no "deep merge" in ES.
     return this.save({
@@ -173,20 +177,20 @@ export default class TargetModel extends GeneratedTargetModel {
   }
 
   /**
-   * Delete credential libraries via the `remove-credential-sources` method.
+   * Delete credential libraries and credentials via the `remove-credential-sources` method.
    * See serializer and adapter for more information.
-   * @param {[string]} credentialLibraryIDs
+   * @param {[string]} credentialSourceIDs
    * @param {object} options
    * @param {object} options.adapterOptions
    * @return {Promise}
    */
   removeCredentialSources(
-    credentialLibraryIDs,
+    credentialSourceIDs,
     options = { adapterOptions: {} }
   ) {
     const defaultAdapterOptions = {
       method: 'remove-credential-sources',
-      credentialLibraryIDs,
+      credentialSourceIDs,
     };
     // There is no "deep merge" in ES.
     return this.save({
@@ -199,13 +203,13 @@ export default class TargetModel extends GeneratedTargetModel {
   }
 
   /**
-   * Delete a single credential library set via the `remove-credential-sources` method.
-   * @param {number} credentialLibraryID
+   * Delete a single credential library/credential set via the `remove-credential-sources` method.
+   * @param {number} credentialSourceID
    * @param {object} options
    * @return {Promise}
    */
-  removeCredentialSource(credentialLibraryID, options) {
-    return this.removeCredentialSources([credentialLibraryID], options);
+  removeCredentialSource(credentialSourceID, options) {
+    return this.removeCredentialSources([credentialSourceID], options);
   }
 
   /**
diff --git a/addons/api/addon/serializers/target.js b/addons/api/addon/serializers/target.js
index 8bf8b6882..df277ed34 100644
--- a/addons/api/addon/serializers/target.js
+++ b/addons/api/addon/serializers/target.js
@@ -7,10 +7,10 @@ export default class TargetSerializer extends ApplicationSerializer {
    * If `adapterOptions.hostSets` is set to an array of host set models,
    * the resulting target serialization should include **only host sets**
    * and the version.
-   * If `adapterOptions.credentialLibraries` is set to an array of
-   * credential library models, the resulting target serialization should
-   * include **only credential libraries** and the version.
-   * Normally, neither host sets or credential libraries are not serialized.
+   * If `adapterOptions.credentialSources` is set to an array of
+   * credential library and credential models, the resulting target serialization should
+   * include **only credential libraries and crendentials** and the version.
+   * Normally, neither host sets or credential libraries or credentials are not serialized.
    * @override
    * @param {Snapshot} snapshot
    * @return {object}
@@ -21,7 +21,7 @@ export default class TargetSerializer extends ApplicationSerializer {
     if (hostSourceIDs) {
       serialized = this.serializeWithHostSources(snapshot, hostSourceIDs);
     }
-    const credentialSourceIDs = snapshot?.adapterOptions?.credentialLibraryIDs;
+    const credentialSourceIDs = snapshot?.adapterOptions?.credentialSourceIDs;
     if (credentialSourceIDs)
       serialized = this.serializeWithCredentialSources(
         snapshot,
diff --git a/addons/api/mirage/config.js b/addons/api/mirage/config.js
index b8d71212d..166ba8f74 100644
--- a/addons/api/mirage/config.js
+++ b/addons/api/mirage/config.js
@@ -464,19 +464,31 @@ export default function () {
       // If adding credential sources, push them into the array
       if (method === 'add-credential-sources') {
         updatedAttrs.credentialLibraryIds = target.credentialLibraryIds;
+        updatedAttrs.credentialIds = target.credentialIds;
         attrs.applicationCredentialSourceIds.forEach((id) => {
-          if (!updatedAttrs.credentialLibraryIds.includes(id)) {
-            updatedAttrs.credentialLibraryIds.push(id);
+          if (
+            !updatedAttrs.credentialLibraryIds.includes(id) ||
+            !updatedAttrs.credentialIds.includes(id)
+          ) {
+            if (id.startsWith('cred')) {
+              updatedAttrs.credentialIds.push(id);
+            } else {
+              updatedAttrs.credentialLibraryIds.push(id);
+            }
           }
         });
       }
       // If deleting credential sources, filter them out of the array
       if (method === 'remove-credential-sources') {
         updatedAttrs.credentialLibraryIds = target.credentialLibraryIds;
+        updatedAttrs.credentialIds = target.credentialIds;
         updatedAttrs.credentialLibraryIds =
           updatedAttrs.credentialLibraryIds.filter((id) => {
             return !attrs.applicationCredentialSourceIds.includes(id);
           });
+        updatedAttrs.credentialIds = updatedAttrs.credentialIds.filter((id) => {
+          return !attrs.applicationCredentialSourceIds.includes(id);
+        });
       }
       return target.update(updatedAttrs);
     }
diff --git a/addons/api/mirage/factories/target.js b/addons/api/mirage/factories/target.js
index 55d12aad8..3b344b3ed 100644
--- a/addons/api/mirage/factories/target.js
+++ b/addons/api/mirage/factories/target.js
@@ -49,7 +49,9 @@ export default factory.extend({
    */
   withAssociations: trait({
     afterCreate(target, server) {
-      let randomlySelectedHostSets, randomlySelectedCredentialLibraries;
+      let randomlySelectedHostSets,
+        randomlySelectedCredentialLibraries,
+        randomlySelectedCredentials;
       randomlySelectedHostSets = server.schema.hostSets
         // BLERG:  fun fact, for no reason at all, the element passed
         // into a where function is not a full model instance, as you might
@@ -64,10 +66,13 @@ export default factory.extend({
           (credentialLibrary) => credentialLibrary.scopeId === target.scope.id
         )
         .models.filter(() => randomBoolean());
-
+      randomlySelectedCredentials = server.schema.credentials
+        .where((credential) => credential.scopeId === target.scope.id)
+        .models.filter(() => randomBoolean());
       target.update({
         hostSets: randomlySelectedHostSets,
         credentialLibraries: randomlySelectedCredentialLibraries,
+        credentials: randomlySelectedCredentials,
       });
     },
   }),
diff --git a/addons/api/mirage/models/target.js b/addons/api/mirage/models/target.js
index d6a7b8ab0..b7a6a36b2 100644
--- a/addons/api/mirage/models/target.js
+++ b/addons/api/mirage/models/target.js
@@ -5,4 +5,5 @@ export default Model.extend({
   scope: belongsTo(),
   hostSets: hasMany(),
   credentialLibraries: hasMany(),
+  credentials: hasMany(),
 });
diff --git a/addons/api/mirage/serializers/target.js b/addons/api/mirage/serializers/target.js
index 00249f164..3ed7be347 100644
--- a/addons/api/mirage/serializers/target.js
+++ b/addons/api/mirage/serializers/target.js
@@ -23,8 +23,11 @@ export default ApplicationSerializer.extend({
         return { id: host_set_id, host_catalog_id };
       });
     }
-    if (model.credentialLibraryIds?.length) {
-      json.application_credential_source_ids = model.credentialLibraryIds;
+    if (model.credentialLibraryIds?.length || model.credentialIds?.length) {
+      json.application_credential_source_ids = [
+        ...model.credentialLibraryIds,
+        ...model.credentialIds,
+      ];
     }
     return json;
   },
diff --git a/addons/api/tests/unit/models/target-test.js b/addons/api/tests/unit/models/target-test.js
index fc5b7c489..cee097ca6 100644
--- a/addons/api/tests/unit/models/target-test.js
+++ b/addons/api/tests/unit/models/target-test.js
@@ -231,7 +231,7 @@ module('Unit | Model | target', function (hooks) {
     );
   });
 
-  test('it has a `credentialLibraries` array of resolved model instances (if those instances are already in the store)', function (assert) {
+  test('it has a `credentialSources` array of resolved model instances (if those instances are already in the store)', function (assert) {
     assert.expect(4);
     const store = this.owner.lookup('service:store');
     store.push({
@@ -250,9 +250,9 @@ module('Unit | Model | target', function (hooks) {
       'Target has two entires in application_credential_source_ids'
     );
     assert.strictEqual(
-      target.credentialLibraries.length,
+      target.credentialSources.length,
       0,
-      'Target has no resolved credentialLibraries because they are not loaded yet'
+      'Target has no resolved credentialSources because they are not loaded yet'
     );
     store.push({
       data: {
@@ -268,7 +268,7 @@ module('Unit | Model | target', function (hooks) {
         attributes: {},
       },
     });
-    // Since `credentialLibraries` is computed on `application_credential_source_ids`,
+    // Since `credentialSources` is computed on `application_credential_source_ids`,
     // not the store itself, it's necessary to do this assignment to kick-off the
     // computed update.
     /* eslint-disable no-self-assign */
@@ -281,9 +281,9 @@ module('Unit | Model | target', function (hooks) {
       'Target has two entires in application_credential_source_ids'
     );
     assert.strictEqual(
-      target.credentialLibraries.length,
+      target.credentialSources.length,
       2,
-      'Target has two resolved credentialLibraries'
+      'Target has two resolved credentialSources'
     );
   });
 
diff --git a/addons/api/tests/unit/serializers/target-test.js b/addons/api/tests/unit/serializers/target-test.js
index 42acd24b6..28dad5d55 100644
--- a/addons/api/tests/unit/serializers/target-test.js
+++ b/addons/api/tests/unit/serializers/target-test.js
@@ -66,7 +66,7 @@ module('Unit | Serializer | target', function (hooks) {
     });
   });
 
-  test('it serializes only credential sources and version when an `adapterOptions.credentialLibraryIDs` array is passed', function (assert) {
+  test('it serializes only credential sources and version when an `adapterOptions.credentialSourceIDs` array is passed', function (assert) {
     assert.expect(1);
     const store = this.owner.lookup('service:store');
     const serializer = store.serializerFor('target');
@@ -78,7 +78,7 @@ module('Unit | Serializer | target', function (hooks) {
     });
     const snapshot = record._createSnapshot();
     snapshot.adapterOptions = {
-      credentialLibraryIDs: ['4', '5'],
+      credentialSourceIDs: ['4', '5'],
     };
     const serializedRecord = serializer.serialize(snapshot);
     assert.deepEqual(serializedRecord, {
diff --git a/addons/core/translations/resources/en-us.yaml b/addons/core/translations/resources/en-us.yaml
index 2579a0763..fcc6e664d 100644
--- a/addons/core/translations/resources/en-us.yaml
+++ b/addons/core/translations/resources/en-us.yaml
@@ -378,6 +378,7 @@ credential-library:
   types:
     vault: Vault
     static: Static
+    username_password: Username & Password
 credential:
   title: Credential
   title_plural: Credentials
diff --git a/ui/admin/app/routes/scopes/scope/targets/target/credential-sources.js b/ui/admin/app/routes/scopes/scope/targets/target/credential-sources.js
index c4dc5ff37..b196734b1 100644
--- a/ui/admin/app/routes/scopes/scope/targets/target/credential-sources.js
+++ b/ui/admin/app/routes/scopes/scope/targets/target/credential-sources.js
@@ -10,15 +10,19 @@ export default class ScopesScopeTargetsTargetCredentialSourcesRoute extends Rout
 
   /**
    * Loads all credential libraries under the current target.
-   * @return {Promise{[CredentialLibraryModel]}}
+   * @return {Promise{[CredentialLibraryModel, CredentialModel]}}
    */
   beforeModel() {
     const { application_credential_source_ids: sourceIDFragments } =
       this.modelFor('scopes.scope.targets.target');
     return all(
       sourceIDFragments.map(({ value }) => {
-        const isStoreOrLibrary = !value.includes('cred');
-        if (isStoreOrLibrary) {
+        const isStatic = value.includes('cred');
+        if (isStatic) {
+          return this.store.findRecord('credential', value, {
+            reload: true,
+          });
+        } else {
           return this.store.findRecord('credential-library', value, {
             reload: true,
           });
diff --git a/ui/admin/app/templates/scopes/scope/targets/target/credential-sources.hbs b/ui/admin/app/templates/scopes/scope/targets/target/credential-sources.hbs
index 31abd9a7d..21468a043 100644
--- a/ui/admin/app/templates/scopes/scope/targets/target/credential-sources.hbs
+++ b/ui/admin/app/templates/scopes/scope/targets/target/credential-sources.hbs
@@ -19,7 +19,7 @@
   </page.actions>
 
   <page.body>
-    {{#if @model.credentialLibraries}}
+    {{#if @model.credentialSources}}
 
       <Rose::Table as |table|>
         <table.header as |header|>
@@ -31,35 +31,48 @@
           </header.row>
         </table.header>
         <table.body as |body|>
-          {{#each @model.credentialLibraries as |credentialLibrary|}}
+          {{#each @model.credentialSources as |credentialSource|}}
             <body.row as |row|>
               <row.headerCell>
-                <LinkTo
-                  @route='scopes.scope.credential-stores.credential-store.credential-libraries.credential-library'
-                  @models={{array
-                    credentialLibrary.credential_store_id
-                    credentialLibrary.id
-                  }}
-                >
-                  {{credentialLibrary.displayName}}
-                </LinkTo>
-                <p>{{credentialLibrary.description}}</p>
+                {{#if (eq credentialSource.type 'username_password')}}
+                  <LinkTo
+                    @route='scopes.scope.credential-stores.credential-store.credentials.credential'
+                    @models={{array
+                      credentialSource.credential_store_id
+                      credentialSource.id
+                    }}
+                  >
+                    {{credentialSource.displayName}}
+                  </LinkTo>
+                {{else}}
+                  <LinkTo
+                    @route='scopes.scope.credential-stores.credential-store.credential-libraries.credential-library'
+                    @models={{array
+                      credentialSource.credential_store_id
+                      credentialSource.id
+                    }}
+                  >
+                    {{credentialSource.displayName}}
+                  </LinkTo>
+                {{/if}}
+
+                <p>{{credentialSource.description}}</p>
               </row.headerCell>
               <row.cell>
                 <Rose::Badge>{{t
                     (concat
-                      'resources.credential-library.types.'
-                      credentialLibrary.type
+                      'resources.target.credential-source.types.'
+                      credentialSource.type
                     )
                   }}</Rose::Badge>
               </row.cell>
               <row.cell>
                 <Copyable
-                  @text={{credentialLibrary.id}}
+                  @text={{credentialSource.id}}
                   @buttonText={{t 'actions.copy-to-clipboard'}}
                   @acknowledgeText={{t 'states.copied'}}
                 >
-                  <code>{{credentialLibrary.id}}</code>
+                  <code>{{credentialSource.id}}</code>
                 </Copyable>
               </row.cell>
               <row.cell>
@@ -77,7 +90,7 @@
                       {{on
                         'click'
                         (route-action
-                          'removeCredentialSource' @model credentialLibrary
+                          'removeCredentialSource' @model credentialSource
                         )
                       }}
                     >
diff --git a/ui/admin/tests/acceptance/targets/credential-sources-test.js b/ui/admin/tests/acceptance/targets/credential-sources-test.js
index 56d375483..1105e9607 100644
--- a/ui/admin/tests/acceptance/targets/credential-sources-test.js
+++ b/ui/admin/tests/acceptance/targets/credential-sources-test.js
@@ -30,6 +30,7 @@ module('Acceptance | targets | credential sources', function (hooks) {
     credentialLibraries: null,
     credentialLibrary: null,
     credentials: null,
+    credential: null,
   };
   const urls = {
     globalScope: null,
@@ -74,6 +75,7 @@ module('Acceptance | targets | credential sources', function (hooks) {
       }
     );
     instances.credentialLibrary = instances.credentialLibraries[0];
+    instances.credential = instances.credentials[0];
     instances.target = this.server.create('target', {
       scope: instances.scopes.project,
       credentialLibraries: instances.credentialLibraries,
@@ -86,6 +88,7 @@ module('Acceptance | targets | credential sources', function (hooks) {
     urls.target = `${urls.targets}/${instances.target.id}`;
     urls.credentialSources = `${urls.target}/credential-sources`;
     urls.credentialLibrary = `${urls.projectScope}/credential-stores/${instances.credentialLibrary.credentialStoreId}/credential-libraries/${instances.credentialLibrary.id}`;
+    urls.credential = `${urls.projectScope}/credential-stores/${instances.credential.credentialStoreId}/credentials/${instances.credential.id}`;
     urls.addCredentialSources = `${urls.target}/add-credential-sources`;
     // Generate resource counter
     getCredentialLibraryCount = () =>
@@ -104,7 +107,7 @@ module('Acceptance | targets | credential sources', function (hooks) {
     assert.strictEqual(findAll('tbody tr').length, getCredentialLibraryCount());
   });
 
-  test('can navigate to a credential library', async function (assert) {
+  test('can navigate to a vault type credential library', async function (assert) {
     assert.expect(1);
     await visit(urls.credentialSources);
     await click('main tbody .rose-table-header-cell:nth-child(1) a');
@@ -112,6 +115,18 @@ module('Acceptance | targets | credential sources', function (hooks) {
     assert.strictEqual(currentURL(), urls.credentialLibrary);
   });
 
+  test('can navigate to a username & password type credential', async function (assert) {
+    assert.expect(1);
+    instances.target.update({
+      credentialLibraries: [],
+      credentials: instances.credentials,
+    });
+    await visit(urls.credentialSources);
+    await click('main tbody .rose-table-header-cell:nth-child(1) a');
+    await a11yAudit();
+    assert.strictEqual(currentURL(), urls.credential);
+  });
+
   test('visiting add credential sources', async function (assert) {
     assert.expect(1);
     await visit(urls.addCredentialSources);
@@ -165,19 +180,46 @@ module('Acceptance | targets | credential sources', function (hooks) {
     assert.strictEqual(currentURL(), urls.credentialSources);
   });
 
-  test('can select and save credential sources to add', async function (assert) {
+  test('can select and save a vault type credential library to add', async function (assert) {
     assert.expect(4);
     instances.target.update({ credentialLibraries: [] });
     await visit(urls.credentialSources);
     assert.strictEqual(findAll('tbody tr').length, 0);
     await visit(urls.addCredentialSources);
     assert.strictEqual(findAll('tbody tr').length, credentialSourceCount);
-    await click('tbody label');
+    await click('tbody tr:first-child label');
     await click('form [type="submit"]');
     assert.strictEqual(currentURL(), urls.credentialSources);
     assert.strictEqual(findAll('tbody tr').length, 1);
   });
 
+  test('can select and save a username & password type credential to add', async function (assert) {
+    assert.expect(4);
+    instances.target.update({ credentialLibraries: [] });
+    await visit(urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, 0);
+    await visit(urls.addCredentialSources);
+    assert.strictEqual(findAll('tbody tr').length, credentialSourceCount);
+    await click('tbody tr:last-child label');
+    await click('form [type="submit"]');
+    assert.strictEqual(currentURL(), urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, 1);
+  });
+
+  test('can select and save both a credential-library and a credential to add', async function (assert) {
+    assert.expect(4);
+    instances.target.update({ credentialLibraries: [] });
+    await visit(urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, 0);
+    await visit(urls.addCredentialSources);
+    assert.strictEqual(findAll('tbody tr').length, credentialSourceCount);
+    await click('tbody tr:last-child label');
+    await click('tbody tr:first-child label');
+    await click('form [type="submit"]');
+    assert.strictEqual(currentURL(), urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, 2);
+  });
+
   test('cannot add credential sources without proper authorization', async function (assert) {
     assert.expect(1);
     instances.target.authorized_actions =
@@ -201,6 +243,20 @@ module('Acceptance | targets | credential sources', function (hooks) {
     assert.strictEqual(findAll('tbody tr').length, 0);
   });
 
+  test('can select multiple credential sources to add and cancel', async function (assert) {
+    assert.expect(4);
+    instances.target.update({ credentialLibraries: [] });
+    await visit(urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, 0);
+    await visit(urls.addCredentialSources);
+    assert.strictEqual(findAll('tbody tr').length, credentialSourceCount);
+    await click('tbody tr:last-child label');
+    await click('tbody tr:first-child label');
+    await click('form [type="button"]');
+    assert.strictEqual(currentURL(), urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, 0);
+  });
+
   test('adding credential sources which errors displays error message', async function (assert) {
     assert.expect(1);
     this.server.post('/targets/:idMethod', () => {
@@ -217,18 +273,38 @@ module('Acceptance | targets | credential sources', function (hooks) {
     });
     instances.target.update({ credentialLibraries: [] });
     await visit(urls.addCredentialSources);
-    await click('tbody label');
+    await click('tbody tr:last-child label');
+    await click('tbody tr:first-child label');
     await click('form [type="submit"]');
     assert.ok(find('[role="alert"]'));
   });
 
-  test('can remove a credential library', async function (assert) {
-    assert.expect(2);
-    const count = getCredentialLibraryCount();
+  test('can remove a vault type credential library', async function (assert) {
+    assert.expect(3);
+    const credentialLibraryCount = getCredentialLibraryCount();
+    const credentialCount = getCredentialCount();
     await visit(urls.credentialSources);
-    assert.strictEqual(findAll('tbody tr').length, count);
+    assert.strictEqual(findAll('tbody tr').length, credentialLibraryCount);
     await click('tbody tr .rose-dropdown-button-danger');
-    assert.strictEqual(findAll('tbody tr').length, count - 1);
+    assert.strictEqual(findAll('tbody tr').length, credentialLibraryCount - 1);
+    await visit(urls.addCredentialSources);
+    assert.strictEqual(findAll('tbody tr').length, credentialCount + 1);
+  });
+
+  test('can remove a username & password type credential', async function (assert) {
+    assert.expect(3);
+    instances.target.update({
+      credentialLibraries: [],
+      credentials: instances.credentials,
+    });
+    const credentialCount = getCredentialCount();
+    const credentialLibraryCount = getCredentialLibraryCount();
+    await visit(urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, credentialCount);
+    await click('tbody tr .rose-dropdown-button-danger');
+    assert.strictEqual(findAll('tbody tr').length, credentialCount - 1);
+    await visit(urls.addCredentialSources);
+    assert.strictEqual(findAll('tbody tr').length, credentialLibraryCount + 1);
   });
 
   test('cannot remove credential libraries without proper authorization', async function (assert) {
@@ -261,4 +337,29 @@ module('Acceptance | targets | credential sources', function (hooks) {
     await click('tbody tr .rose-dropdown-button-danger');
     assert.ok(find('[role="alert"]'));
   });
+
+  test('removing a target credential which errors displays error messages', async function (assert) {
+    assert.expect(2);
+    instances.target.update({
+      credentialLibraries: [],
+      credentials: instances.credentials,
+    });
+    this.server.post('/targets/:idMethod', () => {
+      return new Response(
+        400,
+        {},
+        {
+          status: 400,
+          code: 'invalid_argument',
+          message: 'The request was invalid.',
+          details: {},
+        }
+      );
+    });
+    const count = getCredentialCount();
+    await visit(urls.credentialSources);
+    assert.strictEqual(findAll('tbody tr').length, count);
+    await click('tbody tr .rose-dropdown-button-danger');
+    assert.ok(find('[role="alert"]'));
+  });
 });