Hello there!
SMTP setup is as follows.

I have also enabled following setup in Gmail account according to previous answers in community.

system is throwing following error while testing email setup.

Error says "The mail system returned the following error: "A call to MailKit.Net.Smtp.SmtpClient.Authenticate failed with this message: 535: 5.7.3 Authentication unsuccessful [MN2PR15CA0023.namprd15.prod.outlook.com]".
Still getting error. Can anyone help please.
Regards,
Dixita