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Yes it supports YouTube TV.
Sorry, there was a problem. Please try again later.As of Jan 2019, Vizio supports YouTube TV on "select" SmartCast devices (https://tv.youtube.com/learn/devices/), which should include the 2020/2021 TV models I expect. If not, SmartCast does support Google Cast, so you can always cast YouTube TV instead of using the app.
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