I've been with this problem now for few days. I recently installed and configured Oracle BI 12c to use Ms-Active directory as Authenticator. I've managed to configure LDAPs [Active Dir Over SSL] and I'm able to See all MSAD users and groups in Weblogic Console.
I can use the AD user to login in both Weblogic console and FMW Control. But when I try to use the same user to LogIn to OBI analytics/VA it gives me "The specified credentials could not be authenticated" error and blocks it. The default user "Weblogic" logs in fine in all. I'm using OBIEE 12.2.1.3.0. Any Help is appreciated.