Thank you! I paused in the question, but just got back to it. I'll continue the investigation.

Hello everybody, I decided to release the application while the issue is being resolved. After the release, it turned out that in-app purchases also did not work. Therefore, question number two arises: how did the application pass the review with non-working purchases? I have always believed that the review team carefully checks purchases first.

Sorry, but this is my inattention - new families only work on a closed screen.

Problem solved :) Here I found the reason: https://crunchybagel.com/integrating-apple-music-into-your-ios-app/ Note: A developer token has a finite lifetime. The longest it can be valid for is 6 months. As such, it must be regenerated - either manually or automatically - periodically. I made tokens with expiration of 4 years because I read that JWT can be with any expiration date :)