With Oracle 18c and even better in Oracle 19c, you can manage your Oracle database users in Active Directory. This was supposed to be a very nice new feature as many of us struggle with many thousand users spread over many versions, environments, platforms and even cloud or exadata.
Is this going to help you?
Oracle provides support for Active Directory only on Windows. Client and database must run on Windows
Net Services Administrator’s Guide
Maybe some of my readers working on a Linux-free environment may still like it