I would also love to see this feature. I was using Strawberry (and Clementine before that) years ago, and just recently discovered that it has subsonic support. However, the ability to stream via UPnP to my stereo would complete the experience. Currently there's only one subsonic client on Linux that can do that, and it doesn't always work very well. For an "every thing but the kitchen sink..... well alright, the kitchen sink too" type app like Strawberry, it seems odd for this to be missing. (likely because UPnP is an absolute mess of a protocol, so understandable.... but you can do it... I believe in you) Thanks!

OAuth login works here both with Firefox and Chrome, Linux and Windows. I've tested on macOS with Safari, but that was a while back. On linux the critical part is that the .desktop file is installed and the "mimetype" entry contains x-scheme-handler/tidal. For Windows Tidal must exist as a URL Protocol in the registry, this should be done by the setup https://github.com/strawberrymusicplayer/strawberry/blob/db6aac603c7f557731a1ba3a13817e9c3b69770a/dist/windows/strawberry.nsi.in#L701 This conflicts with the official Tidal app, so if you installed the Tidal app after you installed Strawberry, it will probably stop working with Strawberry. But this doesn't get triggered before you get a successful login on Tidal when forwarded to Tidal by Strawberry. if you get an error there, the App ID could be wrong. I don't remember where I got the App ID from. It was long ago, 2018 I think.