If tv.youtube.com/start is not working on your smart TV, there could be several reasons. First, ensure your TV is connected to the internet and has the latest software updates. Clear the YouTube TV app cache or restart your TV to fix temporary glitches. If the activation code isnt working, try generating a new one at tv-youtube-com-start. Also, check for regional restrictions, as YouTube TV is only available in certain locations. If problems persist, reinstall the app or contact YouTube support. Sometimes, server issues can also prevent tv-youtube-com-start from functioning properly.