Why can’t I make In-App purchases?
Why can’t I make in app purchases
[Re-Titled by Moderator]
iPhone XS Max, iOS 15
Question marked as
Try to delete the app and re-downloading it again from the App Store.
See also the following Apple articles:
If you can’t download or update apps on your iPhone or iPad
If you can’t download or update apps on your iPhone or iPad – Apple Support (UK)
Require a password for App Store and iTunes purchases
Require a password for App Store and iTunes purchases - Apple Support