“Could not verify InAppPurchase with AppStore” after successful purchase by Beta Tester

I have developed an App on Xamarin and I have published it to TestFlight with configuration set to "Appstore | iPhone". As an internal tester I am testing the app and during a purchase scenario when I click Buy, it says "Your purchase was successful", but when I click OK, an error is thrown [file attached] saying "Could not verify InAppPurchase with the AppStore. (CIAP002)".

  • Is it because, the account is of a beta tester?
  • Or is it because of the build configuration "App Store | iPhone", that I have selected?
  • Or something else? Please help, thanks in advance.!
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