Hello, NJohnston! Welcome to the Xfinity Forums.
I can absolutely help you with this issue!
Please send me a private message with your first and last name as well as the username you are trying to log in with.
To send a private message, click my name "ComcastTambrey", then click "send a message".
NJohnston, I'm glad I was able to assist you in getting your username working properly again. Please don't hesitate to reach back out to us at any time if you need assistance again in the future.