Enable Remote Playback through google cast devices in Android 11 media control
"By default, only local media routes are shown. If your app supports other media routes, such as remote playback you'll need to let the system know.
To do this add the MediaRouter jetpack library to your app."
https://android-developers.googleblog.com/2020/08/playing-nicely-with-media-controls.html
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Andrew
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