I have the same problem with my Cambridge 851N network player. The Cambridge Tidal app is not very good so looking for an alternative.
I installed Kazoo on my Note 8 and it sees my 851N but when selected just says "Looking for room". So I installed the BubbleDS Next app which indicates it works for many streaming devices but no love. It finds my 851N and connects to Tidal but if I try to play anything I get the message "No Linn DS Found".
So then I installed the free version of BubbleUPnP for DNLA/Chromecast and it appears to be the exact same software as the BubbleDS Next, BUT IT WORKS! Streaming FLAC through 851N/Tidal. App is much better than the Cambridge app with much more functionality. Don’t know about reliability or dropouts yet but time will tell. Glad I found this thread.
EDIT: The
BubbleUPnP for DNLA/Chromecast app can be shared via Tidal, so I can use the Tidal app to stream FLAC via my 851N. Very cool. Just select "Share" from Tidal and then select the Bubble UPnP app. BOOM!