I am using Shibboleth authentication within survey flow. The authentication works. I have the 'Capture respondent identifying info' box checked, but how do I determine the variable names or 'Field From SSO' available to me after the Shibboleth authentication passes? I'm guessing this is set by my Shibboleth service provider, but what geek speak do I need to use so they understand what I am asking for?

You'll have to ask them for the fields they send.

Environment variables available through Shibboleth authentication

Environment variables available through Shibboleth authentication | Experience Community