App Store purchases failing for unknown reason

Hi, this error is being returned by Apple due to an issue with StoreKit. Unfortunately the underlying error is “StoreKit.StoreKitError.unknown” so the reason why this happened with StoreKit isn’t known but I can give you some things to check:

• If this error is happening in sandbox, please make sure you are logged into a valid Apple sandbox tester account following our docs here
• Looking at your project I can see that your products including coins_starter are “In Review.” Products cannot be fetched if they are in this state, they must be “Ready to Submit” or “Approved.” If your products pass they will be the latter, if they are rejected they will be reverted to the former. Can you let me know once your products change to either state if it works?