Something to try with the saved game(s) that the cheats aren't working.
How To: Use Testing Cheats -
1. At Sims 4 Main Menu, choose the family you want to play. Press Pause after getting into live mode.
2. Press Shift-Ctrl-C all at the same time.
3. Enter testingcheats on or testingcheats true, press enter.
-- Once this is enabled, it should show you a message in the cheat console that the cheats are enabled.
4. Copy or paste the desired cheat, press enter.
5. Press the ESC key or Shift-Ctrl-C again to exit the cheat console.
Sims 4 How To: Cheat - https://www.ea.com/games/the-sims/the-sims-4/pc/how-to-cheat
If that doesn't work, try deleting the localthumbcache.package out of the Sims 4 folder to troubleshoot and try using testingcheats again.
