IAP prompts user to sign in with the Apple ID, happening on Xcode and Testflight build

When I run my Apple Watch app in Xcode I cannot get to the purchase flow. It will always say


Unable to purchase app

Sign in with your apple id from apple watch app on your iPhone

in a popup. I thought the situation would be different in TestFlight however the same is happening to me as well as my testers in TestFlight, despite the IAP already being approved by App Review.


Now how can I solve this issue, how can I make sure this won't lock users out of my app when I release this version to production?


Same to me
IAP prompts user to sign in with the Apple ID, happening on Xcode and Testflight build
 
 
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