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Thanks so much for the detailed explantion on what to do. I have been experiencing exactly the same issue. I.e. recieving a 'unknown product identifier' response when the user/tester click purchase on our app. I tried everything to solve the issue, including reseting the IAP by unchecking 'cleared for sale' and I'm still getting the issue.I logged a detailed report as you suggested using the Apple's new Feedback Assistance portal. Unfortunately it's been 5 days and the case is still open. I tried to call multiple departments, but no one seems to know anything about where I can get help.Would anyone know where the best place is to go from here? I have a case number for the Feedback Assistance: FB7537538Thanks in advance for your suggestions.. warm wishes. 🙂