To obtain your Xfinity activation code, follow these steps: First, ensure you've set up your Xfinity account and activated your service. Once logged in, navigate to the "Activate Your Device" section on the www.xfinity.com/authorize website or mobile app. Select the device you need to activate and follow the prompts. If prompted, enter the required information such as your account details and device information. After completing the process, the activation code will be displayed on your screen or sent to you via email or text message. Enter this code as instructed to activate your Xfinity service successfully.