Visitor

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1 Message

Tuesday, March 24th, 2026 2:22 AM

Activate new cable modem

I purchased a new 3rd party modem. Xfinity directs me to activate modem by using the Xfinity App to register the MAC address of the modem. This registration process keeps failing. I attempted to call the 1-800 support line to manually register MAC address with a live representative. The support line directs me to download and register the modem through the app, then the call disconnects.

Can someone on the Comcast support team please reach out so that we can manually register this modem? The registration process through the app is not working.

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Expert

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116.9K Messages

2 hours ago

Concern moved here to the Customer Service help section for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance.

Official Employee

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2.8K Messages

2 hours ago

 

user_b3ae4a Hi there! Thanks for using our Forums and for taking the time out of your day to write us. We are here happy to help you get the new modem activated and set up. Please send us a DM with your name and address to get started. 
To send a "direct message" / "private message" message to Xfinity Support:
 • Click "Sign In" if necessary
 • Click the "Direct Message" icon
 • Click the "New message" (pencil and paper) icon
 • The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there
 • As you are typing a drop-down list appears. Select "Xfinity Support" from that list
 • An "Xfinity Support" graphic replaces the "To:" line
 • Type your message in the text area near the bottom of the window
 • Press Enter to send it

 

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