Well for starters, try these: http://www.aeriagames.com/forums/en/viewtopic.php?t=1784479
If it still does not work please be patient. This is a problem with closed beta, as far as I understand anyways, and it will be fixed promptly in fact they are working towards fixing this problem at this very moment.
However, if you seriously cannot wait to play I suggest creating a new account. New accounts are practically 100% ensured to be able to play.