I have tried so many things from different imap and smtp servers I found on Microsoft’s website to reinstalling eM Client all together, I cannot find the issue.
I have a personal Outlook / Live account (if you use a personal acct) and used the automatic eM Client setup Wizard. I also had 2 step verification enabled in my Microsoft account. These are the IMAP and SMTP Settings that appeared in my account once the setup wizard completed.
Note:- If its a Outlook Office 365 or Exchange account they would more than likely be different.