I am stuck trying to add a computer account to local admins group via GPO

Hello,

I have a group policy called "Workstation - Local Admins" and I populate the list of accounts that need be be added to the built in group: "Administrators" for all of our PC's.

I have 3 service accounts listed in there, no problem, but when I try to add the SERVER$ it says that "The object selected does not match the type of destination source. Select again." Even though the selection window states "Select User, Computer, or Group".

Is there some kind of trick to doing this?

The only documentation I can find on this only covers adding users.

Thanks in advance!!

Portland Public Schools / Systems Administrator II