Tested using the steam version and works fine. Are you opt-in any beta version? Are you using a game from any other platform? Windows store, epic store etc
I can confirm that the trainer does work in Steam, HOWEVER, it does not work in the Forest native VR mode for us that use SteamVR. I had the AOB issue as well, but after playing regularly without VR, it works just fine. Its an issue with SteamVR.