How to tell if a domain user is a local admin on the machine
Solution 1:
Try net localgroup administrators
instead. If you'd like a PowerShell command to check a specific user, take a look at this blog post. I would hope however that there aren't so many local administrators that you can't spot the user in question.
Solution 2:
Try
C:\>NET USER SomeUser /domain
instead of
C:\>NET USER MYDOMAIN\SomeUser
Solution 3:
Try this command to get all information of the user. it's a powershell command.
GPRESULT -Z /USER [username]