[keycloak-user] SAML IdP Mapping

I have added a SAML IdP and can successfully authenticate. I have also added some mappings to map assertions in the SAML token to database fields. I can see that the SAML token is in the POST back to keycloak contains the assertions i am after, but nothing is appearing in Keycloak. How do I go about debugging this scenario? I'm new to the product. I've switched to DEBUG mode, but I'm not seeing anything definitive. Thanks, Matthew