Add AD security group to local administrators on Hyper-V server running core

 

First connect to the remote server with powershell

Enter-PSSession -ComputerName contosohv01

Next run the command to add the group:

Add-LocalGroupMember -Group "Administrators" -Member "CONTOSO\Hyper-V Admins"

If you're paranoid (like me) and want to check this worked you can use:

Get-LocalGroupMember "Administrators"