For SSO with web browsers, there is a pre-requisite: we must install, manually or otherwise, a browser extension (or addon) for the browser in question on the client machines. I'll keep it simple and use Internet Explorer 11 (IE 11) as an example.
Installing the OneLogin browser extension
First, we can download the addon here:
Internet Explorer extension
If this happens, they should simply click "Enable".
The preferred method to access your Office 365 app via OneLogin is to use the following URL:
So if your domain is contoso.com, you enter:
All we need to do at this point is click on the Office 365 icon and after a moment we are in:
It's then a simple matter of clicking on the Mail, Calendar, People (Contacts) or Tasks icon depending on what we want.
It is possible to use the URL www.onelogin.com by entering it manually or with a shortcut:
Although the directions seem to suggest Outlook will be connecting "through OneLogin" and provide an example of a URL ( firstname.lastname@example.org ), we actually need to use our own domain name. So if our domain name was contoso.com (and if that was the domain used for our email addresses), we would enter the user name as:
Note: to reach this point, we follow the procedure to configure an Outlook profile (please refer to online documentation if you need more guidance):
If we click "Next" as needed, we should see a confirmation message like this, with green check marks:
Once I complete the steps above, I can open Outlook and see my email messages.