Logging on to My Account at comcast.com

This is now a trick question because they are changing your logon user name to the email they have on file for you.

Enter your user name:
(Either your complete e-mail address or the Login ID you created the first time you accessed your account information on Comcast.com)

Be aware that in my case, the email address they had on file for me, even though I switched over to comcast.net, was my old one from ATT ending in attbi.com.

Good luck.