I have 2 iOS app products. One can fetch subscription product information normally, while the other fails with the error errorCode 4040004 'App not found' in Sandbox. The App Store Connect backend configuration should be fine, and the subscription code on the app side is the same codebase for both. I really can't find the root cause anymore — if anyone knows what's going on, please point me in the right direction. Also, I'm able to sync/download the StoreKit product configuration file from App Store Connect directly in Xcode, which should also confirm that my App Store Connect backend configuration is correct.

Hello Apple Developer Support / StoreKit team, I am testing auto-renewable subscriptions on a real iPhone device using Settings > Developer > Sandbox Apple Account > Test Transactions. I found that subscriptions work correctly for one of my apps, but fail for another app under the same Apple Developer account. Working app Bundle ID: com.benbendou.pinyincharacter Product ID: xpyxhz.quarterly Result: The sandbox purchase sheet appears and the subscription flow can be completed successfully. Failing app Bundle ID: com.benbendou.chengyudaquan Product ID: cydq.quarterly Result: The Test Transactions flow fails. In my app, Product.products(for:) can load some subscription products successfully. However, when trying to purchase cydq.quarterly, the purchase fails with: errorCode = 4040004 errorMessage = "App not found. Please try again." Because the same issue also happens in iPhone Settings > Developer > Sandbox Apple Account > Test Transactions, using the exact Bundle ID and Product ID, this does not seem to be caused by my app’s StoreKit code. The strange part is that another app under the same developer account works correctly with Test Transactions, but this app does not. Could Apple please help check whether the Bundle ID / app record / subscription group / in-app purchase products for com.benbendou.chengyudaquan are correctly linked in the StoreKit Sandbox backend? It looks like the sandbox environment can load the product metadata, but cannot complete the purchase or find the app during transaction lookup. Thank you.