When opening Apple Music app on Mac - This iphone is open in another window

Everytime I try to open Apple Music and access music on my iphone (remove/transfer music)

I get this same message saying the iphone is open in another window.

Now there are other answers on here (but wouldn't let me add mine to the page, had to start a new topic) saying close the Music app from full screen window before closing, firstly I do not run music or any other app/program in full screen anyway, so this is not the issue.

Second is people say to delete the Plist entries in Library folder, this doesn't work either.

(Delete ~/Library/Preferences/com.apple.Music.plist & com.apple.Music.eq.plist)

This is an ongoing issue with no real solution or fix, it seems ever time I plug my iphone in

it opens up some secret invisible window on a seperate process.

I have even tried to turn off bluetooth & wifi on my iphone so it's not connected, shut everything down, yet as soon as I open Apple Music on my mac, my iphone is still there connected somehow.

anyone know how to fix this?