So if you capture the HTTP requests from the app and then choose to view the live stream you can see a request going out and then returning with a rtsps:// address for the live stream.
I’m not sure how to test viewing this stream outside of the app though (let alone how we could use it in Home Assistant). I very quickly tried loading it in VLC but it didn’t like it, perhaps because it’s RTSP over SSL (RTSPS) or maybe there’s more to the stream URL that is added by the app?
Needs a bit of investigation, I might have a go but haven’t really the time any day soon.