What are you trying to set up with the Home App?
Does the Vizio come with Android TV installed?
If so, you have to follow the setup on your TV itself and if you use the same account as your Google Home app.
Thanks for the help, @RXShorty.
@Sammyboy, thanks for posting. In addition to RXShorty’s questions, does your TV have a built-in Chromecast? Were you able to link Google assistant using your TV setting? Is the Google Home app updated? Have you tried using another phone to further isolate the issue?
Looking forward to your response.