We are experiencing exactly the same problem. Example: originalTransactionId: 440001375662781 initial buy date: 2023-03-03 We used Get notification history API to load notification history for particular originalTransactionId and renewals (DID_RENEW) notifications returned. Only INITIAL_BUY missing. It means notification doesn't exist on App Store server (No network issue at all). It's rarely but very frustrating. We don't know which notifications are missing. Please help.