Powershell command to add user/group into local Administrators

Add-LocalGroupMember -Group “Administrators” -Member “domain\user or group,” “additional users or groups.”

Add-LocalGroupMember -Group “Administrators” -Member “username”
Add-LocalGroupMember -Group “Administrators” -Member “MicrosoftAccount\[email protected]”
Remove-LocalGroupMember -Group “Administrators” -Member “the same as for adding a user or group”