I get this error code - 21102. It gives a tick as done after purchasing and gets this popup box instead of getting purchase successful and no trace of the transaction.
There is no information available for In‑App Purchases. Try again later. 21102
I'm having the same problem testing on device and on App Store Review. In production it's working.
I'm having the same problem on sandbox testing.
Same problem.
I was having the same problem. Now I have setup a Storekit Configuration file and it is working for testing. https://developer.apple.com/documentation/xcode/setting-up-storekit-testing-in-xcode/