@welzerocci Please try running the EA App as an admin: right-click the desktop shortcut and select "Run as administrator." Wait for the App to load properly before trying to launch Sims 4.
If the App doesn't work, uninstall it with Revo Uninstaller (the free version is fine), and use the Intensive scanning method. Restart your computer, reinstall the App, and repeat the above.
Please also make sure your Steam and EA accounts are currently linked. Try to sign into any EA site (this one is fine) with your Steam credentials. If you land in the correct EA account, it's fine; if anything else happens, let me know.
If the EA App is working and your Steam and EA accounts are linked, but you still can't play, please create a new admin Windows account and try playing there. Make it local, as in, don't link it to your Microsoft account or any email address. (You can keep declining.) You'll be able to try to launch Sims 4 without reinstalling anything. Here too, please run the EA App as an admin and make sure it's loaded before trying to play.
If this doesn't help either, please look for new errors in the Reliability Monitor. Hit Windows key-R and enter "perfmon /rel" without quotes, and you'll see a chart of errors and updates with a column for each day. Today is on the right.
Look for an error that happened at exactly the time of your most recent attempt to launch Sims 4, specifically in the new Windows account. If you find one, double-click it to see more details, then copy that info and paste it into a reply here. If you don't see a new error, check back in an hour or so—the Reliability Monitor doesn't always update right away.
