@WunDaii same for me, it looks fixed right now. I received a response saying, 'Investigation complete - Unable to diagnose with current information,' but it seems like it was a general issue, so they likely fixed it for all users.
Andrii Hanets
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@WunDaii unfortunately no solution yet. I've also filed a report on https://feedbackassistant.apple.com/feedback
The issue was resolved by setting correct subscription levels
Subscription levels: A ranking system of subscriptions within a subscription group that determines the upgrade, downgrade, and crossgrade path available to subscribers. Levels make it possible to offer varying access (basic, premium) of the same service. https://help.apple.com/app-store-connect/#/dev75708c031