Get-LocalGroupMember generates error for Administrators group

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Following commands run on a Windows 10 VM that’s joined to AzureAD:

PS C:\Windows\system32> Get-LocalGroupMember -Group Administrators
Get-LocalGroupMember : Failed to compare two elements in the array. At
line:1 char:1

PS C:\Windows\system32> Get-LocalGroupMember -Group Users
Group NT AUTHORITY\Authenticated Users Unknown
Group NT AUTHORITY\INTERACTIVE Unknown

PS C:\Windows\system32> net localgroup administrators
Members
Administrator AzureAD\UserName

Any idea why the PowerShell Get-LocalGroupMember command is generating an error on the Administrators group whereas net localgroup works as does Get-LocalGroupMember for the Users group?

Answer

This has been referenced as an official bug:

https://github.com/PowerShell/PowerShell/issues/2996

Here is workaround:

http://jdhitsolutions.com/blog/scripting/2342/query-local-administrators-with-cim/

UPDATE:

I had some issues with CIM and WMI.

Here is another workaround which worked everywhere for me.

https://p0w3rsh3ll.wordpress.com/2016/06/14/any-documented-adsi-changes-in-powershell-5-0/

Attribution
Source : Link , Question Author : munrobasher , Answer Author : Luke

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