In-App Purchases - Testing Failures

Has anyone else recently tried to use the IAP component in an app? We have a non-renewable subscription in one of our apps in development, and have never seen it process properly/completely through Test Flight. We thought maybe that was just a behaviour, so we submitted to Apple, and have received a rejection based on App Completeness with the following guidance from Apple:
“Specifically, app showed error message when we tried to purchase care partnership. Please review the details and resources below and complete the 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.”

Is Adalo not functioning to handle getting receipts? How would I as a user have any control over Adalo’s server? I’m rather confused, and wondering if the component isn’t fully functional. My error is similar to the one reported by @jonafied

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