Problem

The default Atlassian login page should still be shown but a possibility is needed to offer SSO to a subset of users. 

Solution

From plugin version 6.5 it is possible to add IdP buttons below the username and password prompt of the Atlassian login page. 

In order to be able to see this button the general redirection needs to be turned off. 

In the Identity Providers settings, you can enable this button and give it a custom name. It is also possible to leave this field blank. In that case, the IdP name will be used for the button. 

In JSM, the buttons will also be displayed on the JSM portal login page when this option is enabled and the default SSO redirection for JSM is turned off.