Why is OAuth2UserService not running for role authorization in Spring Boot under WebSecurityConfigurerAdapter?

I am trying to implement roles with Spring Security by following Spring Security's documentation, but I haven't been able to run the OAuth2UserService.

This is the configuration file that I have and OAuth2UserService, which is following their documentation. The terminal prints ABC, but not DEF so it's not running when I go to the page "/test" as an example. I'm using Google Identity with OAuth2.

The authentication works, but unfortunately this doesn't. I've tried using GrantedAuthoritesMapper and a number of other examples as well, but the same thing happens.

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled = true, prePostEnabled = true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
        .logout(l -> {
            l.logoutSuccessUrl("/").permitAll();})
        .authorizeRequests(a -> a
            .antMatchers("/", "/js/**", "/css/**").permitAll()
            .antMatchers("/test").hasRole("ADMIN")
            .anyRequest().authenticated()
        )
        .csrf(c -> c
            .csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
        )
        .oauth2Login(oauth2 -> oauth2
            .userInfoEndpoint(userInfo -> userInfo
                .userService(this.oauth2UserService()
            ))
        );
    }

private OAuth2UserService<OAuth2UserRequest, OAuth2User> oauth2UserService() {
    final DefaultOAuth2UserService delegate = new DefaultOAuth2UserService();
    System.out.println("ABC");

    return (userRequest) -> {
        System.out.println("DEF");
        OAuth2User oauth2User = delegate.loadUser(userRequest);
        Set<GrantedAuthority> mappedAuthorities = new HashSet<>();

        mappedAuthorities.add(new SimpleGrantedAuthority("ROLE_ADMIN"));

        oauth2User = new DefaultOAuth2User(mappedAuthorities, 
                oauth2User.getAttributes(), oauth2User.getName());
        return oauth2User;
    };
}

Any help would be much appreciated. Thank you.