Re: steam and ea
@quotidi Does it help to run Steam and the EA App as an admin (right-click each shortcut and select "Run as administrator") before trying to open Sims 4? If not, have you made sure your Steam and EA accounts are properly linked and there's no problem on that end? The fastest way to do so is to go to any EA site (ea.com works), click the sign in button, then the Steam logo. If the accounts are linked, you'll land in the correct EA account; if you get an error, let me know.
Please also be aware that the EA App had an outage a few hours ago that has since been resolved.