To activate your Xfinity device online, follow these simple steps. First, connect your device to your TV and power it on. Then, using another device, visit website:- (https://xfinitycom-authorize.com/authorize/). Sign in with your Xfinity account credentials or create a new account if you don't have one. Enter the activation code displayed on your TV screen, and follow the on-screen instructions. This process will link your device to your Xfinity account, enabling you to access all your subscribed channels and services. Ensure your internet connection is stable during the activation process for a seamless experience.