Pre-order code for new expansion

hi
got my pre-order yesterday. when i got the email. i clinked the URL to get my code for the head start. it said to enter such code on my account on mog station. but it keeps coming up invalid code?
help me out...

thanks

i heard there was a thread on forum's for this problem...
if any1 know's or sees it plz link

thanks

From my EU preorder email:

This code will not be active until closer to the launch of the Early Access period, starting 19th June 2015. We will email you again soon when your code can be redeemed.