I have been having two issues with Tidal - one of which I believe I have fixed which is Within the Sonos app when accessing my Tidal Music Library nothing would come up yet when searching I could search Tidal,
Today I have got my music library from Tidal now playing within Sonos. This is what I did.. In the Sonos app go to Settings - in Music Services section tap on Tidal - then Reauthorize Account.
That seems to have solved Sonos accessing my Music Library of Tidal including Playlists, which I saw someone had others working but Playlists stopped working).
Still having an issue casting from Tidal to a Sonos speaker but now at least I can play my music from Tidal to my Sonos speakers.