Symptom: The endpoint check fails with the error "Server returned unexpected status code: HTTP/1.1 401 Unauthorized" despite entering the correct password. You can log on to SAP SuccessFactors with this user and password. You are also using an IAS (Identity Authentication Service) for the authentication.
Reason: The SAP SuccessFactors API URL doesn't use the IAS for authentication. Instead, whatever password is set for the user in SAP SuccessFactors itself is the one the API URL expects. You can verify this the following way:
You have to make sure that the correct password is set in the SAP SuccessFactors Admin Center > Tools > Reset User Passwords