I have a new technician I am needing to add.  We have Active Directory Authentication and Passthrough turned on.  But when I go to add this new tech, I am getting the following error:

FAILURE :Login with same name already exists. Please provide different value for Login Name.

Why is it doing that?  I have added other users with no problem, but this particular user is not adding properly from Active Directory.

Any help would be greatly appreciated.