I have the same problem -
"Your first subscription must be submitted with a new app version. Create your subscription, then select it from the app’s In-App Purchases and Subscriptions section on the version page before submitting the version to App Review." - However, I don't see a way to get to the "in-app purchases and subscriptions" part of the Version Page. When I see online videos they show a "+" button for the new versions but I don't see those for my app.
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Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect
Tags: