Funny, I was just having the same issues. I took advantage of a TIDAL promotion, so I linked that account with Plex. The subscription is not through Plex.
I documented it here:
I described it finally working as intended in the last post there. I’m not sure exactly what did it, but I know that I upgraded to the latest PMS beta and then unlinked and re-linked my TIDAL account. After that, I eventually noticed everything working perfectly.
