SMTP Test email failure

Your software
My Mautic version is: bitnami-mautic-3.3.3-5-r02-linux-debian-10
My PHP version is: 7.3.28
My Database type and version is: mysqlnd 5.0.12-dev

Your problem
My problem is: I configured my AWS mautic instance with Microsoft SMTP and the test connection result is successful however when trying to send a test email getting the below error so please advise how to fix it?

These errors are showing in the log: Expected response code 354 but got code “503”, with message "503 5.5.1 Bad sequence of commands "

Steps I have tried to fix the problem: None