I've submitted by app for review with an IAP for the first time. I have managed to successfully test the IAP myself, in a debug build on device both with a synced StoreKit config file and using the sandbox, as well as with a TestFlight release build with a sandbox account. My app is being rejected however, and the screenshot attached to the rejection shows the error Your account is temporarily unavailable. Try again later [Environment: Sandbox] The initial rejected supplied the below as next steps When validating receipts on your server, your server needs to be able to handle a production-signed app getting its receipts from Apple’s test environment. The recommended approach is for your production server to always validate receipts against the production App Store first. If validation fails with the error code "Sandbox receipt used in production," you should validate against the test environment instead. I'm not even attempting receipt validation through the app, which I know isn't advised but also validation isn't mandatory as far as I'm aware. Could this possibly be an issue with the test devices? I'm not sure how else I can debug this