Yes, sorry I was one of the initial replies to this above stating I have
a Sony Bravia TV. Not sure the version, but it was whatever the latest
was when I posed this; which I'm sure is still the latest.
My Sony Bravia TV is update to date on it's software. I restarted both
my Wifi router and my Google Nest Gen2 Doorbell (Wired) and it is still
not showing on my Sony Bravia Google TV.
Having the same issue too with my Sony Bravia 65A80CK and a Google Nest
Doorbell Wired. Just shows a grey screen with a camera icon in the
middle of the screen with a line though it. However I have a Chromecast.
