Several Battlefield Bad Company multiplayer Beta testers for receiving 'invalid beta key' error messages when attempting to redeem their code on Xbox Live.
An EA forum moderator says:
"We understand that quite a few of you are getting an Invalid Code error when you try to enter your beta code on Marketplace. This is being investigated and I will update this post as soon as I have more information."
Lest hope its not Halo 3 beta all over again!!!