Currently there a few email providers that you can connect to your nation with a dropdown menu (gmail, GoDaddy & others). If you'd like to connect an Office 365 email you need to contact our Frontline team for support.
It would be cool if Office 365 could be added to dropdown since it is a popular email provider and would make the process of connecting an email much faster for people who use it!
Update 11/30 - unfortunately, after research, this isn't something that we are able to complete at the moment.
We are working on this and will let you know when it is complete!