Hi, experiencing the same issue with an error .developerTokenRequestFailed on my iOS app.
My app identifier is configured on the developer web site. But it is not possible to add the MusicKit service.
I have also a Media ID with MusicKit and an associated Key. But I can't find any way to match these identifiers to my App ID.
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My mistake, it works fine.
Using Automatic Developer Token Generation for Apple Music API