Hi there @Matiasdosreis.

Thanks for reaching out, we’d be glad to help.

You may check this article that is designed to help you get the best results when using the Google Assistant on Sonos, then follow the guidelines if you’re having issues:

Help and tips for Google Assistant on Sonos

Upon doing research, I’ve found this relevant thread (though the TV in use is of a different manufacturer), there are suggestions that might help you with this case, here’s the link:

https://en.community.sonos.com/smart-home-integrations-229108/can-no-longer-turn-off-vizio-tv-with-google-assistant-and-sonos-amp-over-hdmi-arc-6831373

Let us know how that goes.

I own a Samsung and needed to link my SmartThings account to GA. I can now say “hey Google, turn off Samsung” and my TV turns off.

Mod Edit: removed typos prior to marking as Best Answer.

THIS! Answer SOLVED the problem! Amazing!!

thank you “BEST ANSWER”