Issue with in-app non-consumable purchase App Store Connect setup

Hi all, We have a game app with a few free levels and then an in-app purchase option to unlock the remaining levels. The setup seems all good in AppStoreConnect and tests well on TestFlight with 3rd party testers. But when Apple reviewers test it, the Purchase button does not seem to work. No bug or specific message - just inactive.

Any idea where to look at?

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Issue with in-app non-consumable purchase App Store Connect setup
 
 
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