Red Hat Ansible Automation Platform LDAP authentication error: "django_auth_ldap Authentication failed for XXX: failed to map the username to a DN."

Issue

• Ansible Automation Platform is configured to authenticate the users from an external LDAP identity store based on Red Hat Identity Management Servers.

• While trying to login to the Ansible Automation Platform, users unable to login to the WebUI and the following error messages are shown in the logs:

  
  2023-05-15 07:33:27,475 DEBUG    [502e74c260864715a58d5b42d698eeca] awx.analytics.performance request: <WSGIRequest: GET '/api/login/'>, response_time: 0.048s
  2023-05-15 07:33:27,594 DEBUG    [11c72ef1b60f4ae3ba84c5ee5ee8f98a] django_auth_ldap search_s('CN=users,CN=accounts,DC=linux,DC=example,DC=com', 2, '(cn=%(user)s)') returned 0 objects:
  2023-05-15 07:33:27,595 DEBUG    [11c72ef1b60f4ae3ba84c5ee5ee8f98a] django_auth_ldap Authentication failed for XXX: failed to map the username to a DN.
  2023-05-15 07:33:27,741 WARNING  [11c72ef1b60f4ae3ba84c5ee5ee8f98a] awx.api.generics Login failed for user XXX from 10.X.X.X
  2023-05-15 07:33:27,871 DEBUG    [11c72ef1b60f4ae3ba84c5ee5ee8f98a] awx.analytics.performance request: <WSGIRequest: POST '/api/login/'>, response_time: 0.385s
  2023-05-15 07:33:27,872 WARNING  [11c72ef1b60f4ae3ba84c5ee5ee8f98a] django.request Unauthorized: /api/login/
  2023-05-15 07:33:29,048 DEBUG    [03459476b77a4232acbc49c1b75c7aa6] awx.main.dispatch task 579fb0be-7b95-44eb-800d-1e7cb581da72 starting awx.main.tasks.system.awx_periodic_scheduler(*[])