TL;DR
App does not appear in Subscription list during free trial.
Details
We set up✻ a week free trial (for my two subscriptions (monthly, yearly) in App Store Connect:
They were approved by Apple and the app is live. During the free trial, the app does not show up in the subscriptions list, neither in the App Store or the device's Settings. Our users can not cancel a subscription during the free trial. What could be causing this?
We are currently updating the app to use StoreKit 2, so maybe that will help. But as you all know, testing subscription flow is not so easy. Even with Xcode's StoreKit Configuration files.
Remarks
For comparison, we subscribed to Apple News+, which has a free trial period. The app does show up in the subscriptions list, and has a Cancel Free Trial button:
✻ The unintuitive sequence for this in App Store Connect is [App] > Subscriptions > [Subscription Group] > [Subscription] > View all Subscription Pricing > Introductory Offers. (Where things in [brackets] will be your own names for app, subscription groups, etc.)