The Sims 3 Registration Code "Invalid"

I once has a same problem with you. I have registered with Origin before with TheSims3.com. So when I did it with thesim 3 web, they said my code was invalid.

I think you should contact https://help.ea.com/ and ask them to generate a new code for registration as I did. I got a new code to regist and everything is ok now.

Hope it helps 🙂