Add AAD account to Local Admin:
Run this to get the currently logged in user's username:
Get-WMIObject -class Win32_ComputerSystem | select username
Run this to add to Local Admin Group:
net localgroup administrators /add %User%
net localgroup administrators /delete %USER%
Examples
net localgroup administrators /add HH\\\\VinayP
net localgroup administrators /add AzureAD\\\\YingOng
net localgroup administrators /add TGTMGMT\\\\BabaoJ
net localgroup administrators /add MANSFIELDS\\\\Sandi.Foran
net localgroup administrators /add AzureAD\\\\DerekLy
net localgroup administrators /delete AzureAD\\\\GiteshGarg
net localgroup administrators /add AzureAD\\\\BuildingManager