The primary function of youtube.com/activate is to authorize a specific device to access a user's YouTube account (subscriptions, watch history, purchased movies) without requiring the user to type an email and password using a TV remote control.
On your computer or smartphone, open a browser and go to youtube.com/activate. youtube.com/activate
If you have multiple accounts, ensure you are logged into the correct one on your phone or PC browser before entering the code. The primary function of youtube
You will see a request asking for permission for the "YouTube on TV" app to access your account. Click . youtube.com/activate