In App Purchases Iphone Not Working. Welcome to apple support communities. If you’ve acquired one of these apps, you can see it in your purchase history, but your family members won't be able to see or redownload it.
Some apps may not be enabled for family sharing. Log out of the current account in settings.app > app store. For iphone 6 and older models:
Sometimes touch id fails to work properly in the app store for authenticating purchases.
Update the app in the app store: I understand that face id is not working properly on your iphone xs. Update the app in the app store: For iphone 6 and older models: