The difference is in the naming context used by Get-ADObject and the DMM Console.
QMM console uses the GC:// protocol to populate information from AD. And Global Catalog contains only a limited subset of properties.
To make the Attribute property searchable from Global Catalog, you must tick the box 'Replicate this property to the Global Catalog' in the Active Directory Schema.
This can be accomplished by following the Microsoft Directions on this site: