email access via POP3 or IMAP fails but works via WebMail

Suddenly (when Xfinity without warning disabled my passwords, so I had to change all of them once I figured out this is why I can't receive emails from there), ONE of the email accounts can not be accessed from either POP3 (Thunderbird) or IMAP (from Amdroid phone).
I can log into the account on Xfinity.com, but the same password doesn't work on external access (and yes, I checked the permission on the account, external access IS enabled)

Anyone has any ideas?