there is one solution - you should update manually chromecast on yout TV
to the latest version ->
https://www.apkmirror.com/apk/google-inc/chromecast-built-in/
Same problem here!After upgrading my 16 years old tv-set with connected
ChromcastGoogleTV dongle ( where I was able to create group of speakers
with my TV ) to the latest one Bravia TV with GoogleTV as a Operating
system , I am not able to add brand ...