My name is***** am sorry to hear that you are having this issue.
I will be glad to assist you with this.
Your XFINITY wireless gateway comes with a default WiFi network name (sometimes called an SSID) and password (sometimes called a network key) that provides secure access to your in-home WiFi network. If you haven't changed your WiFi network name and password ***** you can retrieve your default WiFi information on the side or bottom panel of your wireless gateway:
Did that work for you?
Please let me know if you need more info.