We just enabled AD Authentication but we also had a few pre-created users.

Now here is when our problem kicks in: when a pre-created requester or technician logs it creates a duplicate user?

Also if the user were a technician, it cannot login in as a technician when the domain is selected.

Are there any easy solution on this 'problem'?

Because now its a closed helpdesk system where there are only a few users that can request, but we would like to open it up next year so we are heavily testing it.

Thanks in advance!

Luuk