I made a account to use when joining the domain and added the user to
Builtin\Account Operators (this is what we done in a real MAD, and it works). When I trie to join a computer to the domain with this user it fails (seems like the user is missing rights). Joining a ws with the administrator account works just fine.

Anyone knows how to setup a account with the rights to join a ws to the domain. We're scripting the join so I don't want to use the administrator account.