Unfortunately, you cannot activate YouTube Premium directly using yt.be/activate on your Smart TV. While Yt.be/activate is primarily used to activate the regular YouTube app on Smart TVs, YouTube Premium activation typically requires a different process. To activate YouTube on Smart, you usually need to subscribe to the service through the YouTube app or website on a computer or mobile device. Once subscribed, you can sign in to your YouTube account on your Smart TV, and YouTube Premium benefits will automatically be applied. However, the activation process for YouTube Premium may vary depending on your region and the specific device you're using. It's always a good idea to check the latest instructions provided by YouTube or your Smart TV manufacturer for the most accurate guidance on activating YouTube Premium on your device.