So you were playing with your Early Acces registration code until today. If you ordered the game digitally, you should've recieved another email recently with a new code, for the realy access. You have to enter that new code. If you bought the game physically, it's the code it the box. But I assume you didn't

So check your emails. If you haven't recieved it, which shouldn't be, you can track your new registration number going on this site : www.findmyorder.com You have to find your order no. in your emails.

I hope it helped you.