I'm getting the error Not authorized to send Apple events to Music when running a macro that is using AppleScript to control Apple Music.
Have you verified that your AppleScript editor appears in the Privacy tab of the Security & Privacy settings for Apple Music?
For instance, in the screenshot below, Script Debugger has access to all the apps with the checkmark... the first time you attempt to control and app using AppleScript it will ask for your verification, and if you accidentally clicked no or whatever it was then the scripts will fail.
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At least half of the things I do on my computer are foolish... it happens. 
Glad you got it working!