It's not through Origin that you enable the testing cheats. You enable them in-game.
How to: Turn On/Off TestingCheats
From Sims 4 Main Menu.
1. Load a game and choose the household you want to play.
2. Click the play button in the lower right-hand corner of the screen.
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This puts you in Live Mode.3. Once game is loaded. Click the Pause button.
4. Press Shift-Ctrl-C all together at the same time to bring up the cheat console or cheat box.
5. type in testingcheats on or true.
-- Once this is enabled, it should show you a message in the cheat console that Cheats are enabled.
At this point use the cheats as normal.
6. Press the ESC key or Shift-Ctrl-C again to exit the cheat console.
Read more about testing cheats with the link below:
How To: Turn On/Off and Use Testingcheats - PC/Mac and Console
http://www.carls-sims-4-guide.com/forum/index.php?topic=23632.msg411671#msg411671Sims 4 Cheats
http://www.carls-sims-4-guide.com/cheats.php