…and everything is now working.
I’m not sure exactly what did it, but I think it was unlinking and re-linking my TIDAL account from Plex. I had already tried this a few times when I was first having the issues, but this morning I did it after installing PMS 1.19.1.2589.
I did have to remove previously added albums from my music and re-add them to solve the preview issue demonstrated above.
TIDAL is also working perfectly on my Android tablet without having to reauthorize the Plex app.
The dashboard still shows “Unknown (AAC)” when playing a TIDAL track added to my music, but the player controls is showing the “HI-FI” notification, so I assume it’s playing the correct quality.
(I’m going to mark this post as the solution.)
