@DarkAngelBeckon Please try playing in a new user account on your PC. Make it an admin account, and a local one, as in, don't sign into Microsoft; don't sign into any other services you normally use either. The account name should only contain letters and/or numbers, no special characters or accents. You won't need to reinstall Origin or Sims 4, but you also won't have access to any content from your other account.
If playing in the new account doesn't work, restart your computer and try again, except this time, try playing while your computer is completely offline, as in, disable wifi or disconnect the ethernet cable. I know you've tried being offline before, but I'm interested to know whether it works in the new account.