Quote Originally Posted by Lemonmentos View Post
Did you buy it through the digital download store?
Go to store.na.square-enix.com/orders
and find your order. (the order number will be in the email they sent you).
The email doesn't contain the serial code for the game. You need to go to the order page and get it there.
Once you enter it you will be able to play.

edit: I had the same issue and that fixed it for me.

My problem is that EVERY code on this order page is invalid.