Hello! We have the same issue. And it's happening in Production as well.Actually this happens not only when redeeming subscription offer. You can try purchasing a regular subscription while current is still active. When you're downgrading subsription or cross-grading with dirreferent duration, you will still get 'You're all set' message but an error that transaction failed.I found this message from Apple staff (read Rich's answer): https://forums.developer.apple.com/thread/112663I don't know how to avoid this issue and it's very frustrating.
renat6
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