If you have a Smart TV or other streaming device and you enter a code at yt.be to link your mobile device to that device, you can view YouTube on your TV even if you aren't connected to Wi-Fi.
Open the YouTube app on your Smart TV or streaming device.
Go to Settings.
Scroll to Link with TV code. A blue TV code will show on your TV.
Have your phone or tablet ready and continue with the steps in the "Enter the code" section at yt.be.
Open the YouTube app or yt.be on your phone or tablet.
Tap your profile picture and select Settings.
Tap Watch on TV
Tap Enter TV Code and enter the blue TV code shown on your TV
You can remove any linked devices by following the steps below. Remember, once a device is removed, you’ll need to use a new code if you ever want to link the device again.
On your Smart TV or streaming device, open the YouTube app.
Go to Settings
Select Linked devices
Select Unlink all devices to unlink all devices at once.
On your phone or tablet, open the YouTube app.
Select your profile picture .
Tap Settings.
Select Watch on TV.
Select Delete Devices.
Tap DELETE to remove the linked Smart TV or streaming device.