I tried through sandbox account and testlight external testers with the same result:The very first time a user attempts to purchase, he gets the prompt "Sign in required" and needs to enter his apple ID and password. After clicking Buy, another prompt appears "Confirm your app purchase" where the user needs to enter the apple id and password once again.Clicking Buy brings back the "Sign in required" prompt and the loop goes on forever.If the user taps "cancel" and tries to make the purchase it then immediately works as it should. It's almost like the first attempt is a write-off.While the apple prompts are happening, no code gets executed so I can't debug it. The only thing I know is that the transaction state goes through "purchasing" and remains in that state until I click "cancel" which fails the transaction as it should. When trying again I get the purchasing followed by the purchased state as it should.Any ideas?Edit : I downloaded Apple's sample project "InAppPurchases" and the exact same thing happens. Maybe it's a bug with 13.4?

If an external tester makes an IAP in build 1, will it persist on build 2 or will the user have to purchase again?I'm working on an issue that occurs on the initial purchase and not on the built it "you already bought this" hence my question