Outlook Windows 11

First, xfinity has nothing at all to do with your install of Windows 11.  The code you posted is a windows error, not a network error.  See this KB article:

https://answers.microsoft.com/en-us/outlook_com/forum/all/outlook-error-code-0x800ccc0e/2f295cfb-7322-4c96-9684-8a3c811a1e7e

As for xfinity deleting your email account, they do not do that.  In fact, when you leave xfinity, your xfinity email account stays active.  

It would appear that you either have corrupted files, corrupted windows install, or an update changed your settings.  

@user_6tbmku ,

Outlook shows connected to my (comcast.net) account and has worked flawlessly for years, but now a sych error code (0X800CCC0E) has appeared overnight. Additionally as it appears that Xfinity is mucking around they have also deleted my addition secure E-Mail account, for which I like to personally thank someone.

Is your secure E-mail account a comcast.net account?  When was the last time you signed in to webmail?