When I first got these cameras (pre firmware 1.4.1... I think it was 1.3.7?) I was briefly able to view the feed steam via Google Home app Favourites screen.

Since 1.4.1, I was unable to view feed stream in Favourites screen but could still view feed if I viewed the devices directly, in Google Home app. 

Since latest firmware update 1.5.1 I can now no longer view anything in Google Home app at all. 

Being able to see everything in Google Home app was the whole reason I switched from Grid Connect to Tapo in the first place... Now, it's turning out to be a waste of money, just like Grid Connect, as the functionality isn't what it was purported to be. You shouldn't be advertising "works with Google Home" if it doesn't or you're going to take away functionality like this appears to be.