I have added a Windows 10 Pro machine to my Windows Server 2012 domain, and it is working fine for the most part.
Now, I was testing a domain user with this machine, and at the beginning I added the user to the "Power Users" in the local machine groups.
Now that everything seems to be Ok, I removed the domain user from "Power Users" to simple pedestrian "Users" group in the local machine.
Now when I try to login to the domain from the Windows 10 Pro test machine, it seems like is going to login but then it says "signing out" and that's it, I can't login.
If I remove the domain user from the local machine "Users" group and add the domain user back to the "Power Users" group everything goes back to normal and the domain user can login to the domain from the local machine no problem whatsoever.
Any ideas why this is happening?