On server 2012 when setting up RDS the licensing diagnoser will still show not licensed even though the licensing manager show licensees. This will affect users when the 180 day trial runs out. In order to fix this the server mode and license server need to be set in the local server policy or group policy.

Local Computer Policy -> Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Licensing Use the specified RD license servers =
Set the Remote Desktop licensing mode = Per User or Per Device depending on licenses bought