3590108 - The logon url under IAS - 'Allow users stored in Identity Authentication service to log on' throws HTTP 400

• The Identity Authentication Service (IAS) application is set up to use the corporate IdP as Default, but the 'Allow users stored in Identity Authentication service to log on' setting is not functioning as expected.
• The expectation is that users can access the application with their Identity Authentication credentials. However, upon invoking the logon URL and entering credentials into the login screen, a HTTP Status 400 is received.

Identity Authentication Service

BTP, Identity Authentication Service, IAS, login, Allow users stored in Identity Authentication service to log on, HTTP 400, corporate IdP, logon URL. , KBA , BC-IAM-IDS , Identity Authentication Service , Problem