Re: I lost the registration code for my The Sims Medieval game.

@Pachilles7 Moved to the Medieval forum.

Did you ever register the game ? If not, I don't think there's anything anyone can do but if you did, contact a game advisor

Game advisors can be found through live chat.

1. https://help.ea.com/en/contact-us/ 
2. Click on the orange NEXT button
3. Select a platform
4. Click on the orange NEXT button
5. Select a topic and describe your problem in a few words
6. Click on the orange NEXT button
7. Click Chat Now to chat with a Game Advisor
   

In Details here: How to contact a Game Advisor using the new EA Help page