First, check here to see if there is an "outage";
The serial number you see in the XfinityMyAccount app is actually the MAC address of you modem not the mfr serial number.
Hi there, DY1128.
I want to do my best and help if it is still needed. I know internet troubles can be very frustrating.
If so, can you please private message me your full name? Thank you for posting to our forums.
To send a private message, please click my name "ComcastMartin" then select "Send a Message" on the right side.