I posted this question to the nvidia forums, but I figured I'd give it a go here as well.
When I cast to my Shield TV using an Android phone or tablet, a notification appears on other Google devices on my network. I would like to turn these notifications off for the shield altgether, as described here:
https://support.google.com/chromecast/answer/7206638?hl=en
and here:
Unfortunately, I seem to be unable to do this from my Android phone/Google Home App. When I tap the Shield's device card menu in the Google Home app, instead of getting a "Device Info" menu with the option to turn off "Let others control your casted media," I only see the "backdrop settings" menu ( https://imgur.com/tpc0mKP ). If I try to go to the device settings menu ( https://imgur.com/R8ddpWf ) while casting, the phone pops up a message that says "Could not communicate with your Android TV" ( https://imgur.com/FLnnB4P ), but casting works fine otherwise.
I have tried power cycling the Shield and the phone; deleting Google Home app data and uninstalling/reinstalling Google Home from my phone; and, as a last ditch effort, I tried doing a factory reset on the shield. No luck.
Any Ideas?
Nougat on S7 this worked
Settings--> Google --> Cast media controls.
Also read the little blurb under it, follow from there, looped like you did. Looks like it needs to be disabled per device now. Not exactly sure if the above is what you are after either, control and notifications have blended?