I am trying to add an AD account as a Global Admin in EPO 4.6. When I click save I get the message "An unexpected error occurred." The user account I am trying to add is a Domain Admin account so I can run AD sync tasks.
I'm not sure what the error message means, without seeing a copy of your database - but it may not be necessary
You don't need to add an AD user to ePO in order to run the AD tasks - instead, all you need to do is specify he AD user to use when you set up the registered server. ePO will then use these credentials when the task runs. Give that a try - hopefully it will solve the problem