Your function works for me.

Add error checking to your function.


Function AddUserToGroup ($DomainString, $DomainGroupString, $LocalString, $LocalGroupString)

	Dim $GroupObj
	? "Adding $UserName to $GroupName. Please Wait..."

	$GroupObj = GetObject("WinNT://" + $LocalString + "/" + $LocalGroupString)
	$GroupObj.Add ("WinNT://" + $DomainString + "/" + $DomainGroupString)
	? "@error @serror"

	$GroupObj = 0
EndFunction


Whatr is the result?
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