Re: EA app says sims 4 open and it’s not

@peepthecat  Please uninstall the EA App with Revo Uninstaller (the free version is fine), and restart your computer before reinstalling.  The EA App isn't usually the cause of this particular error, but it's best to address any potential complicating factors.

If OneDrive is running on your computer, whether you use it or not, please pause syncing before trying to play.  You can see the option by right-clicking the cloud icon in the lower-right corner of the screen.

If that doesn't help, please create a new admin Windows account and try playing in that.  Make it local, as in, don't use your Microsoft login.  You'll be able to (try to) launch Sims 4 without reinstalling anything, but your saves and other user data won't be available.  That's fine for the purposes of this test.