Solved changed the getAuthorities method as follow:

public List<SimpleGrantedAuthority> getAuthorities() {
        List<SimpleGrantedAuthority> authorities = new ArrayList<>(getPermissions()
                .stream()
                .map(permission -> new SimpleGrantedAuthority(permission.getName()))
                .toList());
        authorities.add(new SimpleGrantedAuthority("ROLE_" + this.name));

        return authorities;
    }