We have the same issue in Moon Active and it's very critical for us. We're about to release a new version of our app, but can't finish RC testing because any TestFlight build uses sandbox mode and we can't verify that purchases work properly there.
We did a super detailed investigation on our end to make sure it's not our environment and the result is the same as described. The finishing of the purchase just don't work (don't update the purchase status) and the next attempt of purchasing same product will result in "This In-App purchase has already been bought"
Would be great to hear any official comments from Apple.
Best regards
Oleksandr Dudnik
Technical Group Manager, Moon Active
alex.d@moonactive.com
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
https://developer.apple.com/forums/thread/678070
Same issue described in this thread. Still no answer from Apple