Go to tv.youtube tv/start on your device and sign in with
the Google account you use to watch YouTube. If you don’t
have a Google account, you can create one during the
activation process. Once you’re signed in, you’ll see a list
of devices that are eligible to watch YouTube TV. Select
the device you want to use and follow the on-screen
instructions to complete the activation process.
https://www.mytvcodeenter.com/tv-youtube-tv-start/
