Unity IAP init failed with InitializationFailureReason.NoProductsAvailable on iOS

Hi, there are some users of our game that have encountered this problem on iOS, iap init failed with the reason InitializationFailureReason.NoProductsAvailable. The proportion of users that have this problem is obviously higher in China than in other countries or regions. But the code of the game is the same on Apple Store.
Please help me find the cause of the problem, any help will be appreciated.

 

Please provide the device logs from a device with this issue. Are these on legitimate Apple devices, and do these users have access to the App Store in China? Many users are blocked by the great firewall. https://forum.unity.com/threads/how-to-capturing-device-logs-on-ios.529920/