Possibly some good news (call it a sticking plaster) for Tidal users.
I have a Chord Poly and control it using a free app on my phone called BubbleUPnP. This enables connection to my Tidal account and then I can cast/stream to the Poly (or the phone) or other UPnP renderers/players. Since December this supports Tidal Hi-res streams.
I also have several Squeezeboxes and run LMS on a home server. By installing the UPnP/DNLA Media Interface plugin in LMS (it's listed down at the bottom of the plugins list in the 3rd Party plugins), you can still play Hi-res Tidal through the Squeezebox, controlled using BubbleUPnP on the phone, by selecting the Squeezebox as a renderer/player in the BubbleUPnP app.
Seems to work fine, listening to Pulse (192/24) right now.
(This solution courtesy of the Logitech forums suggested by Paul Webster, and of course AndyG who greated the plugin).