I purchased and downloaded BFBC2 through Windows Live. When I go to play online/multiplayer, I have to register with EA... I enter my contact information and then it asks for my serial key, so I enter the only key I have, which is the Game Activation key... which gives me an error saying it is invalid. Talked to EA support and they say contact Microsoft. wtf - how do I play BFBC2 multiplayer?
The key that came with the game should be the one to activate the game and possibly the multiplayer mode. EA are putting your off track by telling you to contact Microsoft, EA are the only ones who can help with their games, and with their activation codes.
XBOX LIVE Ambassador and Enforcement United