Unable to send SMTP mails using office365 settings

Outlook doesn't provide to send using different from address other than your username to log in.

You need both email address same.

You can add one or more sender in your admin panel after that you can send easily from different addresses.

This error means the user whose credentials you specified in the SMTP connection cannot submit messages on behalf of the user specified in the From and/or Sender MIME headers or the FROM SMTP command.