@mike More investigation.
For Eleni Karaindrou the albums do not even appear in Tidal, either app or browser. In Roon, under the artist, three albums appear in the Tidal section, under Singles and EPs, which are the marked Unavailable. So no real conflict, the albums can’t be played, but why does Roon show them.
Barre Phillips is different. In the Tidal app, three albums appear and are playable. All Albums, no singles. In Roon, those three albums appear, one is unavailable. Ten others appear, eight are unavailable, even one by John Surman where Phillips presumably appears.