We used to get this error, cause our products are set up in Monetization/In-App Purchase section, specifically non-consumable. We then switched to set up products in Monetization/non-

We used to get this error, cause our products are set up in Monetization/In-App Purchases section, specifically non-consumable. We then switched to set up products in Monetization/Subscriptions: Non-Renewing Subscriptions. We no more got errors about: An In-App Purchase has been returned. Hope this could help someone in the future. Best luck in building your dream chaps!

This is the most basic bug in Apple's source code. We really need this solved. It slows down apps!!!!!!!!!!!!!!!