Configuring preferences and options in Outlook.com
3/9/2022 My connected account after about 12 hours finally started receiving emails again but still no luck on ever being able to modify the settings.
For anyone who has to add or modify an email it looks like your going to have to switch to the Microsoft Mail app and here's a link I found on how to add
https://chemicloud.com/kb/article/how-to-easily-setup-a-pop3-email-account-in-windows-10-mail/
But I would like to stress what IDIOTS are working on Microsoft's Outlook platform. If you're not going to support the feature then give a message that says that and points the users to a webpage that explains it. Not a try again later message if the Sync Email settings are never going to be available.
Also I'm a commercial software developer for 20+ years and I can tell you the total lines of code required to handle syncing POP and IMAP emails is probably less than 1000. That includes the code required to store your settings in the database. All the heavy coding is done by the existing Microsoft Windows dll files and hasn't really changed in decades. There was absolutely no valid reason I can think of for removing the connected accounts or Sync email from Outlook.com.