How export members of one DL that have members across different domains?

I'm trying to export the current members of a DL for a request.  
I have tried the following old bat file but it only pulls the users on the domain of the server I'm on.

'=====================
Set wshNetwork = WScript.CreateObject( "WScript.Network" )
strUserDomain = wshNetwork.UserDomain
strUserComputer = wshNetwork.ComputerName
strUserName = wshNetwork.UserName

strGroup = InputBox("Please type the AD group name to get members of:", "Group Name", "mf_users")
Set objWinntObject = GetObject("WinNT://" & strUserDomain & "/" & strGroup)

strResults = "Results" & VbCrLf & "======="
strResults = strResults & VbCrLf & "Group: " & objWinntObject.Name
strMembers = GetMembers(GetObject("WinNT://" & strUserDomain & "/" & objWinntObject.Name))
strResults = strResults & VbCrLf & strMembers & VbCrLf

Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objOutputFile = objFSO.CreateTextFile("DomainGroups.txt", True)
objOutputFile.Write strResults
objOutputFile.Close
Set objOutputFile = Nothing
Set objFSO = Nothing

MsgBox "Done.  Please see output text file."

Function GetMembers(objGroup)      
      strMembers = ""
      
      For Each objMember In objGroup.Members
            If strMembers = "" Then
                  strMembers = objMember.Name
            Else
                  strMembers = strMembers & VbCrLf & objMember.FullName
            End If
      Next
      GetMembers = strMembers
End Function
'=====================

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I've tried using the Query search within ADUC looking for the Member of "distinguishedName" but still that query is not pulling all the members. [and I which to the different domains]

I tried this cmd to view the members to see if its displays all the members across all the domains: Get-DistributionGroupMember –identity “group name” | ft name, primarysmtpaddress

But again no...what cmd can I run that will ensure I'm pulling all members into a cvs file for all 3 domains?

Thanks