Hi,
we made a strange discovery that might be helpful to other developers.
This week, we released a universal app (Mac/iOS/iPadOS) on the App Store. Normally, when the app is "Ready for Distribution", it takes around 10 to 30 minutes to be available on the App Store using the direct url/link – but not this time.
We waited 12 hours and the app was still not available using the direct link to our app. We noticed that in the "Pricing and Availability" section, it showed "175 (Countries) Processing" instead of the usual "175 (Countries) Available".
Upon digging through the sections on App Store Connect, we noticed that we forgot to fill out the "App Accessibility" features. Upon filling out the "App Accessibility" features, the app went live a few minutes later and the "Pricing and Availability" section changed to "175 (Countries) Available" the same minute.
There was no warning or indication of anything missing on App Store Connect.
In case your app is "Ready for Distribution" and is not showing up on the App Store, please remember to check the "App Accessibility" section.