First, I hope my English is well understandable ;D
I did the following: I first tried to change my passwort, as Cry-Adam said. But this didn′t work.(in the forums and in gamesas i was able to log in with this new password, but not in the game)
After that I created a new Account(INGAME), same Password, same E-Mail, but different Username. And: It runs! I am able to log in the game!
I also checked on gamesas by using my E-Mail adress, and now I am automatically logged in as my new Username.
So the problem seems solved.
Auf Deutsch:
Im Spiel selber neuen Account erstellen, das Passwort und die E-Mail des "defekten" Accounts benutzen. Aber den Username ?ndern, also einen anderen benutzen! Anschlie?end dürftet ihr zu den Nutzungsbedingungen weitergleitet werden, und der Multiplayer sollte funktionieren.
All in all I think it′s a very nice game! Very good graphics and a high performance, and also the gameplay is kinda revolution
I hope I could help you!