E-mail access on multiple devices stopped working two days ago, xfinity log-in works fine

Two days ago, multiple e-mail clients on multiple devices stopped working for Comcast e-mail, only.  The username and password are valid when logging into xfinity.  Yahoo mail has not happened yet.  I've tried logging in (entering the credentials for comcast email), but it just says something is wrong.  I toggled the third-party email access button in xfinity settings without a change.  I even successfully changed the password and confirmed, and tried the new password to no avail (for e-mail, works for xfinity).  The web mail stinks on a phone.  Just want to get access like it was before it all magically stopped on a few devices.

Suggestions?