Sending Xfinity eMails via Outlook 2016 Suddenly Stopped Working

This is my 3rd day with the following issue.   I have called & chatted with Xfinity technicians 3 times and they were clueless.  Each one wasted over an hour of my time reading the same script with no resolution.  While chatting with 1 technician yesterday, I was transferred to 2 other technicians.  Each one started over with the same script until I finally said enough is enough and quit the chat.  The very first technician that I spoke to on Sunday, said it was Microsoft's issue. I called Microsoft but was not able to speak to a human.  I have posted on multiple boards with no resolution.

On 12/17/23, I logged into xfinity.com and was asked to update my password.  I have 4 eMail accounts across 2 different desktops for different family members.  I changed the password on two of my accounts.  I then went into Outlook on my desktop and updated the password for those 2 accounts.  Right after doing that, I was no longer able to send eMails via Outlook.  I was able to receive eMails..  This happened on all 4 accounts at the same time even though I only changed password on 2 of them.  I then logged back into Xfinity.com and was able to both send and receive emails.  It only stopped working on Outlook.

I then tried my iPhone and iPad and received the same error message.

Here are the error messages that I received when trying to send an eMail.

Sending reported error (0x800CCC67).  ESMTP server temporarily not available, please contact support.

 

I have tried everything that I could find info on. I turned off the firewall, anti virus pgms, reinstalled Outlook, etc.  But still have this issue.

I also physically deleted one of the eMail accounts and added it back in.  Still cannot send eMails via Outlook.

On Sunday night, everything started working again. I thought everything was good to go. But, Monday morning the same issues happened. Can no longer send eMails. The whole day went by and I was not able to send eMails.  THen late Monday night, it started working again.  I woke up this morning, and once again it is not working.

Very frustrating spending 2 days trying different things only to end up failing. Searching the Internet I have seen others who have posted same issue after updating their passwords. They too have not received an answer on how to fix the issue.

Anything left for me to do?