IE 11 security prompt with SAML redirect for login - The webpage you are viewing is trying to close the tab.
When using OKTA with Portal (as an IDP), when you click the Sign in with my enterprise login a new tab opens which redirects to the IDP. Once you sign in the IDP attempts to close the tab and redirect on the original tab which creates a popup that says:
The webpage you are viewing is trying to close the tab. Do you want to close this tab? Y / N