Problem with concurrent sessions and OAuth2 in Spring Boot

I'm working with Spring Security 5.6.0 and OAuth 2.0 authentication. I'm trying to limit the concurrent sessions for each user to one. After some tries, I managed to write this code:

@Override
protected void configure(HttpSecurity http) throws Exception {
  http
  [...]
    .sessionManagement()
    .sessionFixation().migrateSession()
    .sessionCreationPolicy(SessionCreationPolicy.IF_REQUIRED)
    .invalidSessionUrl("/expired")
    .maximumSessions(1)
    .maxSessionsPreventsLogin(true)
    .sessionRegistry(sessionRegistry());

with

@Bean
public SessionRegistry sessionRegistry() {
    SessionRegistry sessionRegistry = new SessionRegistryImpl();
    return sessionRegistry;
}
@Bean
public HttpSessionEventPublisher httpSessionEventPublisher() {
    return new HttpSessionEventPublisher();
}

Yet, this doesn't work for some reason, letting two different browsers make API calls with the same user logged in. Any suggestions?