At the moment if you authenticate to your IdP with Qlik Sense SaaS and it fails for any reason, you end up back at a text-only JSON message in the browser.
This isn't very user-friendly as end users could end up at this page if, for instance, their admin hasn't added them to the group that has permission to use Qlik Sense in their IdP config. Just a nicer looking page with a note to check with your IT admin - and of course the specific error as is currently shown.
Qlik Partner Ambassador 2024