Re: Cannot play Sims 4 after unlinking from STEAM
@syrupe94 Please clear the EA App's cache—these files don't necessarily get removed during the uninstall process—and restart your computer afterwards.
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
If that doesn't help, try adding the free holiday pack to your EA account. For some players at least, this also adds the EA App version of the base game.
If that doesn't help either, you'll need to contact EA customer support and ask that the Steam version of Sims 4 be removed from your account. I'd strongly suggest choosing live chat rather than email, since you'll get a faster and likely more helpful response. If you don't see the option for live chat, change the location in your browser window to U.S. or U.K., or choose a slightly different category of issue.