Why Does Sonos Desktop Duplicate Apple Playlists?

The Sonos Desktop app has no actual way to create an Apple Music playlist, deliberately or accidentally. There is no API to do that.

Maybe it is displaying them twice? (Looks like it based on the screenshots).

Maybe the itunes xml file is someone duplicating them?

What do my Windows apps (see profile) show for the same items?

It’s pretty clear there is some duplication happening in the desktop app but I am unable to locate where, why and how.

You probably have another copy of the iTunes playlist somewhere else that Sonos can access.

Often it is in a Recycle Bin.

Try renaming it and seeing if one is renamed or both….

I’ve not touched iTunes in years, I only use Apple Music. When a service is added to Sonos, it is auth’d to the same account as Apple Music, which only has the individual playlists, not duplicates. That is the same email I sign in to Sonos with and is my only and primary Apple Music email address. There’s nothing in my iTunes library anyway, almost forgot how to even use it 🙂

No duplicates in iOS Apple Music either. Also, the playlist duplicates only happen in the Playlist sub menu on Sonos IOS, on the Sonos Home page (pinned collection), there are no duplicates.

None of the above addresses what I've mentioned though.  Where is the library? On a PC or NAS? Maybe there's a backup folder or similar being indexed by Sonos.  Wherever Sonos is looking for the library, do a manual search on there for the library file (xml still?).

It’s not a local library, it’s simply playlists created directly on Apple Music and adding Apple Music as a service.

Aah, OK, apologies. Is the ‘Music Library’ option empty?

But also, as above, if you temporarily rename a Playlist do both versions change name?

I'm not an Apple user, could there be some other Syncing going on to somewhere that contains the same content - i.e. the duplicates?

Also, if you add a track to a Playlist, does it instantly show up in the duplicate?

Music library is mapped to a local NAS but rarely used. In answer to the question, do they all update, yes, they do:

I am wondering if this has something to do with sharing the Apple playlists with other users. Does Apple Music reflect that to Sonos as a duplicate instance, to be honest that may well be the $64,000 question. I am going to delete the playlists from my other half’s phone later and see if that removes the duplicates.