If you attempt to change the permissions using a Display Name, the admin commands should respond with a warning and tell you the username of that account so you can correct your (probable) error. At the moment I quite often try to change permissions and then later notice that what I'm looking at in the top left is a Display Name.
If you attempt to change the permissions using a Display Name, the admin commands should respond with a warning and tell you the username of that account so you can correct your (probable) error. At the moment I quite often try to change permissions and then later notice that what I'm looking at in the top left is a Display Name.