Have you checked the object class?

Make this change to check the class what is returned.
Code:

For Each $objComputername In $objDomain
   redim preserve $list[ubound($list)+1]
   $list[ubound($list)] = $objComputername.Name
   ? "Name: " + $objComputername.Name
   ? "Class: " + $objComputername.Class
Next

What is the class of the objects returned?
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