Automated Login

I am currently looking at auto logging in a user into the IPCortex portal which we host inside an iframe within our product. We have a user token which we can use to successfully retrieve a Session Cookie via the auth REST API endpoint, but once a Red60urne cookie is set in the session and attempt to navigate to a page within the portal we are still directed to the login page. I was hoping to discuss a potential solution and to get a better understanding your user authentication.