Biometric Authentication Behavior in IAP Sandbox Environment

Where the problem occurs:

• In-app purchase
• Non-ApplePay
• Non-local authentication login

Environment where the problem occurs: Sandbox environment (Development environment, TestFlight environment)

Problem handling process:

1. Open page A in the app and purchase product B (auto-renewable subscription) on that page.
2. User authentication is required to purchase product B.
3. During the authentication process, the user needs to enter the Apple account and Apple account password.
4. After completing the authentication, complete the purchase of product B.

Problem in step 3: Why is FaceID or TouchID not used for authentication?

Note: Face ID and Password -> iTunes Store and App Store -> Status is Enabled