IAP failed to read purchase

In-app purchases do not seem to be working properly in Unreal Match 3 or other games

1. Open Unreal Match 3
2. Check to make sure in-app purchases are completely turned on for the project.
3. Package for iOS Shipping
4. Upload to iTunes Connect
5. Download game onto an iOS device

Result: In-app purchases are failing to read purchase
Expected Result: The in-app purchases should be working properly.