Hello,
Our app gets rejected for the reason that the reviewer cannot purchase the subscription with the message,
"Guideline 2.1 - Performance - App Completeness
We found that your in-app purchase products exhibited one or more bugs which create a poor user experience.
Specifically, we were unable to purchase Auto-Renewable Subscriptions. The app launched back to the rendering when we tap on the "Get started""
When we test this with our sandbox accounts in test flight version, we can see the subscribe pop up showing and purchase successfully. But turns out they cannot. Unfortunately we cannot see the reason why and even after requesting further explanation regarding how to move along, we are not getting any explanations.
Our subscription products are submitted in the first time with the app and they are in "In review" state for more than a week.
We requested phone calls and wrote messages to reviewers many times but unfortunately there's no help yet.