Casting Jellyfin through Tailscale connected device

[Jellix]

I also use Android devices, which have been my main devices in the past. But to be honest, I became tired about all this hassels and exceptions regarding this or that won't work like expected. Also Chromecast was one of the worries I put much time into. However, in your case it might be a solution just take a simple cable and connect by wire since modern smartphones are delivering audio and video through their USB-C connectors.