Seems that Plexamp currently has some issue with Tidal, maybe this is related to playlists only. I’m using the latest version 1.1.0 of Plexamp on macOS 10.14.3.
If I select Tidal as Plexamp source both “My Tidal” and “My Tidal Playlists” is empty, even if it should contain content (e.g. Plex Apple TV app shows them as expected). Also if I search for a playlist and try to play it (tried both from search results screen by clicking play button on the cover and from details page by clicking play and/or shuffle button there) I always end up with this empty screen:
Is this a known issue?
If you need any logfiles I can provide some.