Patientez un peu, il s'agit juste d'un problème du côté de EA (codage HTML de la page d'enregistrement). La page renvoie quelque fois "clé invalide" bien que votre clé soit bonne.
"Many if not all of you entering keys in this week have probably gotten the "unsuccessful" message. Well if you are entering a valid key from your Kane's Wrath box and getting this message, its actually an HTML error.
YOUR KEY IS VALIDATING and YOU ARE SUCCESSFUL.
Problem is on our back-end we are fixing some code so our system syncs up the key. To keep it simple in explanation, the page should be telling you "successful". "
Source : http://forums.ea.com/mboards/thread.jspa?threadID=355497&tstart=0