Re: Game won't start via EA App due to faulty activation
@EnricoFrancis This error typically happens because your ownership of a given game can't be verified. It's not that the game has been blocked or removed from your account, at least not these days—the EA App has other errors associated with that. But perhaps your computer can't communicate with EA servers, or something along those lines.
At any rate, are you able to connect your computer to a different network? For example, if it has wifi, you could set your phone as a mobile hotspot, with the phone using data rather than your home network. You'd only need to do this for long enough to see whether you can start Sims 3; this shouldn't use much data at all.
If you use a third-party antivirus, please also make sure it hasn't recently blocked anything EA-related.