So it is not a full server crash or a firewall misconfiguration. It is not something we can fix on the Customer Side. Xfinity uses a backend similar to what I use to work with personally 10 years ago, so …
The Mail and Calendar apps for Windows 10 don’t support two-factor authentication. If two-factor authentication is turned on for your account, you’ll need to create an app password for that account. An app password is used instead of your normal …