How to get the Apple Music Embed widget to recognize authorization

I've got a web app that uses Music Kit to access authorized user's playlists and such.

One feature of the app is to show a list of tracks, and I am using the Apple Music Embed code in an iframe to display their nicely designed track widget.

The problem I have is that although the user has already authorized Apple Music within the app, using a configured MusicKit instance, the widget doesn't recognize this.

This leaves the tracklist in a state where only previews can be played. And if the user wants to play the whole track they need to click Sign In, which opens a window to enter a user name and password, and then displays, "You're signed in".

QUESTION: How can I get the widgets to recognize the fact that the user has already signed in?
How to get the Apple Music Embed widget to recognize authorization
 
 
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