Hi Joan, are you getting an error message? That would be helpful in knowing what to suggest. But generally speaking:

Could you try starting from https://www.xfinity.com/hub/

Toward the upper right, there's an account button (looks like a little head and shoulders in a circle) that opens a panel to sign in.

Any luck using the "Check Email" link on that account panel?

Works for me. see screenshot https://connect.xfinity.com/appsuite/#!!&app=io.ox/mail&folder=default0/INBOX Like J said, a screenshot of the issue would be helpful.