Cannot register a client - Spring Boot Admin 2.0.2

Question

I am developing according with documentation: https://codecentric.github.io/spring-boot-admin/2.0.2, but i don't getting register a client in a secure application.

My configuration are:

application.yml

# Security config
spring.security.user:
  name: admin
  password: admin

# Actuator config
management:
  endpoint:
    shutdown.enabled: true
    health.show-details: always
  endpoints.web.exposure.include: '*'

# Spring boot admin config
spring.boot.admin:
  context-path: /admin
  client:
    url: http://localhost:8080/admin
    username: ${spring.security.user.name}
    password: ${spring.security.user.password}
    instance:
      name: ${app.name}
      metadata.user:
        name: ${spring.security.user.name}
        password: ${spring.security.user.password}

WebSecurityConfiguration

@Configuration
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {
    private final String adminContextPath;

    public WebSecurityConfiguration(AdminServerProperties adminServerProperties) {
        this.adminContextPath = adminServerProperties.getContextPath();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        SavedRequestAwareAuthenticationSuccessHandler successHandler = new SavedRequestAwareAuthenticationSuccessHandler();
        successHandler.setTargetUrlParameter("redirectTo");
        successHandler.setDefaultTargetUrl(adminContextPath + "/");

        http.authorizeRequests()
                .antMatchers(adminContextPath + "/assets/**").permitAll()
                .antMatchers(adminContextPath + "/login").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin().loginPage(adminContextPath + "/login").successHandler(successHandler).and()
                .logout().logoutUrl(adminContextPath + "/logout").and()
                .httpBasic().and()
                .csrf()
                .csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
                .ignoringAntMatchers("/instances", "/actuator/**");
    }

}

And the error is occurring:

2018-08-22 00:44:21.770 DEBUG 9616 --- [gistrationTask1] d.c.b.a.c.r.ApplicationRegistrator: Failed to register application as Application(name=template-api, managementUrl=http://localhost:8080/actuator, healthUrl=http://localhost:8080/actuator/health, serviceUrl=http://localhost:8080/) at spring-boot-admin ([http://localhost:8080/admin/instances]): 401 null

Can someone please help with this 401?

UPDATED 2018-09-01:

I tried separate configs and the same error occurs:

Server:

# Security config
spring.security.user:
  name: test-name
  password: test-password

# Spring boot admin config  
spring.boot.admin:
  context-path: /admin

Client:

# Spring boot admin config
spring.boot.admin:
  client:
    url: http://localhost:8080/admin
    username: test-name
    password: test-password
    instance:
      name: ${app.name}
      metadata.user:
        name: test-name
        password: test-password

Answer 1

There was a bug in the Spring Boot Admin documentation. It was fixed.

https://github.com/codecentric/spring-boot-admin/issues/894