Hey @Masahiro Aoki!
This is generally expected behavior, and is behavior that is outside of the Purchases SDK since it is handled by the system. In sandbox, it’s expected that you will occasionally be prompted to enter your testing credentials to make test purchases.
In production, you should ensure you are signed into an iCloud account before making a purchase. The system may still require a password, though, if it deems it necessary to complete the purchase.
Hi,
I am facing the same issue. When I press the purchase button normally a modal bottom sheet appears and with side button it checks the situation with Face ID and completes the purchase. But in my app it wants Apple ID and password. Is there any solution or I am missing something?