Não consigo pegar o token do oAuth2 Spring Boot 2.1.3

Estou tentando criar uma API RESTful com spring boot usando oAuth2, quando tento dar um post em /oauth/token a resposta é um 401 e sem um corpo na resposta.

alguem tem alguma dica do que pode ser? eu reparei que os end points não apareceram o logger, mas nessa versão nova do spring boot parece que não aparece tudo mesmo. seguem as Classes de configuração:

AuthorizationServerConfigurerAdapter

@Configuration
@EnableAuthorizationServer
public class AuthorizationServerConfiguration extends AuthorizationServerConfigurerAdapter {

    private static final Integer TRINTA_MINUTOS = 180;

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private TokenStore tokenStore;

    @Autowired
    private BCryptPasswordEncoder passwordEncoder;

    @Override
    public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
        security.passwordEncoder(passwordEncoder);
    }

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
                .withClient("angular")
                .secret("$2a$10$ZSifxi0cKomJQXGFvnDi8eBwHSVya8LhiL9zTgF/cOa5QZbefU3T6")
                .scopes("read", "write")
                .authorizedGrantTypes("password")
                .accessTokenValiditySeconds(TRINTA_MINUTOS);
    }

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints
                .tokenStore(tokenStore)
                .authenticationManager(authenticationManager);
    }

}

ResourceServerConfigurerAdapter

@Configuration
@EnableWebSecurity
@EnableResourceServer
public class ResourceServerConfiguration extends ResourceServerConfigurerAdapter {

    @Autowired
    private BCryptPasswordEncoder passwordEncoder;

    @Autowired
    public void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
                .withUser("admin")
                .password("$2a$10$VPpoZa8REzUDIkHXmaQHieisavZryR.pZvvPK.l7wrmb6..VL1LTy")
                .roles("ROLE").and().passwordEncoder(passwordEncoder);
    }

    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/categorias").permitAll()
                .anyRequest()
                .authenticated()
                .and()
                .httpBasic()
                .and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and().csrf().disable();
    }

    @Override
    public void configure(ResourceServerSecurityConfigurer resources) throws Exception {
        resources.stateless(true);
    }

}

WebSecurityConfigurerAdapter

@Configuration
@EnableAuthorizationServer
@EnableResourceServer
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Bean
    public TokenStore tokenStore() {
        return new InMemoryTokenStore();
    }

    @Bean
    public BCryptPasswordEncoder passwordEncoder() {
        BCryptPasswordEncoder bCryptPasswordEncoder = new BCryptPasswordEncoder();
        return bCryptPasswordEncoder;
    }

    @Bean
    @Override
        public AuthenticationManager authenticationManager() throws Exception {
        return super.authenticationManagerBean();
    }
}

Logger do spring

2019-03-02 20:07:06.735 TRACE 24424 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : 
    c.a.a.a.c.CategoriaController:
    {POST /categorias}: save(Categoria,HttpServletResponse)
    {GET /categorias/{id}}: findById(Long)
    {GET /categorias}: categorias()
2019-03-02 20:07:06.739 TRACE 24424 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : 
    c.a.a.a.c.LancamentoController:
    {DELETE /lancamentos/{id}}: remove(Long)
    {POST /lancamentos}: save(Lancamento,HttpServletResponse)
    {GET /lancamentos/{id}}: findById(Long)
    {GET /lancamentos}: pesquisar(LancamentoFilter,Pageable)
2019-03-02 20:07:06.745 TRACE 24424 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : 
    c.a.a.a.c.PessoaController:
    {DELETE /pessoas/{id}}: remove(Long)
    {PUT /pessoas/{id}}: update(Pessoa,Long)
    {POST /pessoas}: create(Pessoa,HttpServletResponse)
    {PUT /pessoas/{id}/ativo}: updateStatus(Long,Boolean)
    {GET /pessoas/{id}}: findById(Long)
    {GET /pessoas}: pessoas()
2019-03-02 20:07:06.754 TRACE 24424 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : 
    o.s.b.a.w.s.e.BasicErrorController:
    { /error}: error(HttpServletRequest)
    { /error, produces [text/html]}: errorHtml(HttpServletRequest,HttpServletResponse)

estou usando o postman dando um basic auth e passando no corpo username, password e grant_type.