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You cannot add a user account from a trusted Windows Server 2003 domain to the local Administrators group on the computer when you use an account of the trusted domain together with a smartcard
Article ID: 937472 - View products that this article applies to.
Consider the following scenario:
Workaround 1When you add a user account from DomainA to the local Administrators group, click Locations in the Select Users, Computers, or Groups dialog box to change the current location to DomainA. Then, specify the user account in a "Username" format instead of in a "DomainA\Username" format.
Workaround 2Type the following command at a command prompt to add the user account from DomainA to the local Administrators group:
net localgroup administrators add DomainA\Username
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 937472 - Last Review: January 4, 2008 - Revision: 1.0