Remote desktop CAL license apply issue

Hi,

I encountered a Remote desktop license issue, my O/S is Windows servere 2008, since the 120 days grace period expired so I purchase a "Microsoft WinRmtDsktpSvcsCAL 2012 Sngl OLP 1License NoLevel UsrCal 5 Quantity' from my vendor.

I have applied the license to my server through Licensing Manager, however when I checked the remote desktop session host configuration, it still show the grace period for remote desktop session host server has expired. I tried access the server through remote desktop, not work. Can anyone advise anything missing? thanks.