Can anyone assist with the Outgoing mail server settings to use with SDP to connect to an Office365 mailbox?

I've seen a few posts on here where people have got it working but their settings are not working for me. I am using the following:

Server Name: smtp.office365.com

Alternate Server Name: blank

Senders Name: IT

Reply-to Address: same as Incoming address

Email Type: SMTP

TLS Enabled: Yes

Port: 587

Requires Authentication: Selected

Username and Password Set

When trying to send an email I get an error: Sending Notification failed.

Any help/advice would be appreciated!

Thanks.