This works: https://www.odoo.com/documentation/16.0/applications/general/calendars/outlook/outlook_calendar.html
Configure the permissons on the authentication Tab in Azure Portal to multi-tenant, if this is missed, it wont wokr and a error is displayed

Antony, We've just released the Odoo-Office 365 connector and you may wish to take a look if it helps you.

https://www.slideshare.net/jaynvora/odoo-office-365-integration

I try to figure how to do this and I didn't find any solution. The close solution I find is here:

https://github.com/odoo/odoo-extra

But is not a convenient one.