You can't claim the game, it's that simple.
you either get "invalid password or email" and that's the thing the BI store is SCREWED. You register a username, assign a password, associate an email. Then to login, it asks for your username, then refuses it because it actually wants your email, then it refuses THAT.
Only after linking the account (already created beforehand) to facebook did I get past that nonsense.
Then you get stuck in the "claim game in store" "game claimed" "you need to claim game in store first" loop.
FOR A FREE GAME.
So I actually wasted 5 minutes of my life and opened a support ticket. They, seriously, asked for my user name, email AND PASSWORD.
Run away from this game people, you are seriously just handing over your email to these people for god knows what purpose, you will NOT be playing this game.