Re: Invalid Code Error While Registering Sims 3 on EA Website
@kimysaur If you registered the game in the EA App, the code has already been used and can't be registered a second time. The Store site should already recognize that you own the game, as long as you're signing in with the same email address and password as you use in the EA App: the Store draws from the same database as the other EA services.
Please sign in with that email and password, go to My Page, and see whether the site thinks you own the content you've registered. It's listed on the left and down a bit: