diff --git a/addons/api/addon/serializers/account.js b/addons/api/addon/serializers/account.js
index 08a6a6028..37fbc9270 100644
--- a/addons/api/addon/serializers/account.js
+++ b/addons/api/addon/serializers/account.js
@@ -4,6 +4,11 @@
  */
 
 import ApplicationSerializer from './application';
+import {
+  TYPE_AUTH_METHOD_PASSWORD,
+  TYPE_AUTH_METHOD_OIDC,
+  TYPE_AUTH_METHOD_LDAP,
+} from 'api/models/auth-method';
 
 export default class AccountSerializer extends ApplicationSerializer {
   // =properties
@@ -26,13 +31,31 @@ export default class AccountSerializer extends ApplicationSerializer {
    */
   serialize(snapshot) {
     switch (snapshot.record.type) {
-      case 'password':
+      case TYPE_AUTH_METHOD_PASSWORD:
         return this.serializePassword(...arguments);
-      case 'oidc':
+      case TYPE_AUTH_METHOD_OIDC:
         return this.serializeOIDC(...arguments);
+      case TYPE_AUTH_METHOD_LDAP:
+        return this.serializeLDAP(...arguments);
     }
   }
 
+  /**
+   * LDAP serialization limits the `attributes` posted on create and omits
+   * `attributes` entirely on update.
+   */
+  serializeLDAP(snapshot) {
+    const { isNew } = snapshot?.record || {};
+    let serialized = super.serialize(...arguments);
+    delete serialized.attributes;
+    if (isNew) {
+      serialized.attributes = {};
+      const { login_name } = snapshot.record;
+      if (login_name) serialized.attributes.login_name = login_name;
+    }
+    return serialized;
+  }
+
   /**
    * OIDC serialization limits the `attributes` posted on create and omits
    * `attributes` entirely on update.
diff --git a/addons/api/tests/unit/serializers/account-test.js b/addons/api/tests/unit/serializers/account-test.js
index 326298a26..d630df393 100644
--- a/addons/api/tests/unit/serializers/account-test.js
+++ b/addons/api/tests/unit/serializers/account-test.js
@@ -8,6 +8,7 @@ import { setupTest } from 'ember-qunit';
 import {
   TYPE_AUTH_METHOD_PASSWORD,
   TYPE_AUTH_METHOD_OIDC,
+  TYPE_AUTH_METHOD_LDAP,
 } from 'api/models/auth-method';
 
 module('Unit | Serializer | account', function (hooks) {
@@ -186,4 +187,68 @@ module('Unit | Serializer | account', function (hooks) {
       version: 1,
     });
   });
+
+  test('it serializes LDAP-type with only login_name in `attributes` on create', function (assert) {
+    assert.expect(1);
+    const store = this.owner.lookup('service:store');
+    const serializer = store.serializerFor('account');
+    const record = store.createRecord('account', {
+      type: TYPE_AUTH_METHOD_LDAP,
+      name: 'Name',
+      auth_method_id: '1',
+      description: 'Description',
+      login_name: 'Login Name',
+      full_name: 'Full Nname',
+      email: 'Email',
+      dn: 'dn',
+      member_of_groups: ['Group'],
+      version: 1,
+    });
+    const snapshot = record._createSnapshot();
+    const serializedRecord = serializer.serialize(snapshot);
+    assert.deepEqual(serializedRecord, {
+      type: TYPE_AUTH_METHOD_LDAP,
+      name: 'Name',
+      auth_method_id: '1',
+      description: 'Description',
+      version: 1,
+      attributes: {
+        login_name: 'Login Name',
+      },
+    });
+  });
+
+  test('it serializes LDAP-type without `attributes`', function (assert) {
+    assert.expect(1);
+    const store = this.owner.lookup('service:store');
+    const serializer = store.serializerFor('account');
+    store.push({
+      data: {
+        id: '1',
+        type: 'account',
+        attributes: {
+          type: TYPE_AUTH_METHOD_LDAP,
+          name: 'Name',
+          auth_method_id: '1',
+          description: 'Description',
+          login_name: 'Login Name',
+          full_name: 'Full Nname',
+          email: 'Email',
+          dn: 'dn',
+          member_of_groups: ['Group'],
+          version: 1,
+        },
+      },
+    });
+    const record = store.peekRecord('account', '1');
+    const snapshot = record._createSnapshot();
+    const serializedRecord = serializer.serialize(snapshot);
+    assert.deepEqual(serializedRecord, {
+      type: TYPE_AUTH_METHOD_LDAP,
+      name: 'Name',
+      auth_method_id: '1',
+      description: 'Description',
+      version: 1,
+    });
+  });
 });