Cannot make in app purchase for hello neighbor game

I cannot complete the in app purchase of the hello neighbor full game on my son’s iPad which is linked to the family account. We didn’t get the parent approval notification on our devices either. Now when we startup the game it states “the purchase process is completed incorrectly. Click restore purchases”, but that doesn’t work and selecting to buy the game again makes the app hang. I’ve tried restarting, soft reset on all devices, and reinstalling the game but nothing works.