And, sorry, didn't mention it - the app is in the 'Pending Developer Release' state

Sorry, I did not notice that I was sitting under my other account. I'll repeat my message on my own behalf: 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 again :) Account holder didn't confirm paid application agreement.