Caused by: java.lang.RuntimeException: org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "user-resource-role-mappings" (Class org.keycloak.representations.adapters.config.AdapterConfig), not marked as ignorable
I was able to track this down to the code in AdapterConfig in the org.keycloak.representations.adapters.config package. In there, it is defined as "use-resource-role-mappings"
When I changed it to this it worked.
I believe the doco has a typo that needs to be fixed.
Cheers
Travis