The entered credential or authentication information does not work or are no longer accepted by provider. Please change them.

My secondary email account is no longer accessible, even through the xfinity.com site.  Clicking on the gear icon, "email settings" and then "Accounts", I see the secondary account has the message "The entered credential or authentication information does not work or are no longer accepted by provider. Please change them."  I have clicked on the "edit" link for the secondary account and changed its password but after doing so I still get the same message.  For what it's worth, I have also clicked on the "edit" link for the primary account where I only see three lines: "Account name", "Your Name" and "Email address".