Using New Outlook on Windows for professional communication and productivity
I have found a solution for you guys.
There is a problem with outgoing port in IMAP account setting.
Open Account setting.
Open IMAP server setting.
Under outgoing mail drop down Manu set encryption SSL/ TLS
Uncheck (Require logon using Secure password Authentication SPA)
Check the box (My outgoing (SMTP) server requires authentication. and select (Use same settings as my incoming mail server)
For Mac Outlook Users.
Open account settings
Click More options
Set authentication (Use incoming server info)
That worked for me.
Thank you.