I have been enjoying Roon/Tidal and the various playlists I have compiled on Roon for several months, using my iMac as a core and three end points all of which worked fine.
Now all I get when I try to play a song from a playlist or a song from an album is “this track is currently not available from Tidal”.
Which track is this, can you share a screenshot of the album cover? If you try to search for the track instead of opening it from the playlist, does it play then?