Same probleme here.
I ordered the game yesterday, got an e-mail saying a had the early acces and yet, when i want to register the code, "invalid code". I don't know if it's normal regarding the fact i ordered yeasterday (perhaps SE did not change the e mails....) or if the just stole my money.
And, of cours, i don"t get any answer on the french forum....
(bought my game on the official SE website)