We found that your in-app purchase products exhibited one or more bugs when reviewed on iPad running iOS 14.5.1 on Wi-Fi.
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.
johny73
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