It would help to have a valid Peacock subscription to activate Peacock on your Vizio TV. You can sign up for a Peacock subscription on their official website Peacocktv.com/tv

Peacocktv.com/Vizio Prices And Plans

Peacock offers two plans on Vizio Smart TVs:-

• Peacock Premium costs $5.99 per month and includes a limited selection of movies, TV shows, live news, and sports. You will see ads with this plan.
• Peacock Premium Plus costs $11.99 per month and includes all of the content available on the Premium plan, plus no ads and the ability to download content to watch offline.
  You can also sign up for an annual plan for either Peacock.com/tv Premium or Peacock Premium Plus. The annual plans cost $59.99 and $110.99, respectively.