IAP not working in iOS builds?

Hey, I have a big problem with iOS purchases in my mobile game. My IAP works fine in the editor, but once I put the game on a phone (my game is already published on the app store) the purchases don’t work. It isnt a problem with the buttons, and the IAP is apparently fine too because apple approved all of my products for sale. Is there something I’m missing? Does anyone have experience with this?

EDIT: I also seem to be getting this error

"Could not find a part of the path “D:\Unity Projects\Game [iOS]\Assets\Plugins\UnityPurchasing\Resources\BillingMode.json”.

Have u been able to fix it?? I’m having the same issue and it’s super annoying