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One thing you can try is have a Real ID or Battletag friend on a different realm invite you to a group, thus moving you to their realm where the quest may be functioning properly.
Another option is to wait until a realm restart and check the quest immediately afterwards.
You can open a ticket, but there may be little a Game Master can do other than suggest that you make a bug report on the issue - http://us.battle.net/wow/en/forum/1012660/
Support Forum Agent
^^ This is indeed the most common reason for this, folks don't travel over the completion trigger.
I'd recommend fully logging out, then running up, see if that helps.
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