Our App has an in-app purchase (IAP) which works correctly using Testfilght . Our App was rejected with the following message:
We remain unable to access the in-app purchase products in your app because they do not return an action after being tapped and allowing for several minutes for this to process. This occurred when your app was reviewed on iPhone and iPad running iOS 13.7 on Wi-Fi.
I have added IAP in Xcode-Capabilty
the status of IAP is "waiting for review"
works correctly in Testfilght