Thanks for posting.
Make sure your devices are connected to the same network and within 15-20 feet of your router. Try reinstalling your Google Home app. If you'll get the same result, try checking if there's an update available on your Sony TV.
Let us know how it goes.
Chiming in to see if you still need assistance with this. Hope the previous post helped. Let us know if you have additional questions, otherwise we’ll be locking the thread.
Due to inactivity, I'll go ahead and lock this thread in 24 hours. Feel free to start a new thread if you need assistance with your Google speakers and we'd be glad to assist you further.