Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)
Ethernet
Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)
LUMIN D2 HDMI
Description Of Issue
Under my playlist and Tidal favorites almost all albums say unavailable. They worked normally for over a year. Check all account Info. reinstalled Tidal.
As @wklie mentioned, your Lumin is not a Core, the Roon Core is typically a PC that has the Roon app installed on it or a dedicated music server machine.
To post screenshots, you can use the instructions located in the link @dylan posted above, here they are again: Screenshot Instructions (<-Click-able link).
Are the same playlists play-able in the TIDAL Web Browser (listen.tidal.com)?