Hi Jake Reva!
Please, follow this link to test `Inbound SAML Flow` https://gluu.org/docs/gluu-server/4.2/tutorials/passport-inbound-flow/ with `Shibboleth SP` instead of using `Demo app`. Closing this ticket, recreate a new ticket if you face any issues on `Inbound SAML with Shibboleth SP`.
Thanks and Regards
~ Shakil