Missing album on Sonos

[pilgrim]

The Sepiamusic album Trenches is available on the normal Spotify app, but when I search on Sonos it doesn't appear either as an album listed for artist Sepiamusic or by an album title search.  

If I use the Spotify app to create a playlist for the album then the playlist appears on the Sonos app showing the tracks however all but three of the tracks are marked as unavailable.

Any ideas?