Cannot use email as user id

Flowable Engine
1

I’ve integrated LDAP and trying to use mail field as user id.
User data displayed in IDM seems to be fine, but when I access to Modeler/Task, app throw warning below and redirect to login page.

flowable-all-in-one-app_1 | 2020-08-04 06:25:12.278 WARN 1 --- [nio-8080-exec-7] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]

Converter setting looks good, do you have any idea?

flowable-engine/modules/flowable-app-engine-rest/src/test/java/org/flowable/app/rest/DispatcherServletConfiguration.java

@Override
    protected void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.favorPathExtension(false);
    }
2

That exception is usually because the response has data that it can’t convert. How does your response look like?