OK so I managed to have Guardian save the session for web login. The issue was that I was using a Guardian pipeline in my router.ex configured in a separate umbrella app, which was configured to return JSON Web Token exclusively to ALSO manage sign_in() and sign_out() via a session. It just didn’t work.
In the app that contains phoenix, the solution was to configure in my config/config.exs another instance of Guardian which would manage a separate pipeline and plug under the app which shared the app namespace with phoenix. Both these Guardian pipelines seem to co-exist OK in the same router.ex file. Probably easier to show than write this out.. but it works.
