Many to Many Relationship with 2 FK referencing from same PK Laravel 8

Hello I am working on a Laravel project, that i have to assign for one Mentorship «Mentoria», one Mentor «Mentor» and one student «Mentorando». The data of the student and the mentor, came from the Users table (i assigned them roles, using Spatie) , and the other table is called «Mentoria» Since there exists a many to many relation i created the pivot table that is called «utilizador_mentoria» and has ID_Mentor, ID_Mentorando (both are FKs coming from the users table),and ID_mentoria (coming from Mentoria table). I defined both models as this:

User Model:

 protected $casts = [
    'email_verified_at' => 'datetime',
];

public function interesses(){
    return $this->belongsToMany(AreaInteresse::class, 'utilizador_interesse', 'id_utilizador', 'id_interesse');
}

public function mentorias(){
    return $this->belongsToMany(Mentoria::class, 'utilizador_mentoria', 'id_mentoria', 'id_mentorando', 'id_mentor');
}

ps: I have interesses function with other model, that is working properly. my problem is with the «mentorias»

Mentoria Model:

  public function users(){
    return $this->belongsToMany(User::class, 'utilizador_mentoria','id_mentor','id_mentorando','id_mentoria');
}

With this, i am trying to get the data from all Mentorias, and the data of the Mentor that is assigned to that that Mentoria, however when i am doing this code on the controller, the data coming from the user appears empty, despite i have the DB filled with data. I tried a echo for testing, and it only shows the data of the Mentoria, and where it should appear the data of the Mentor assigned to that MEntoria, it is empty

the code from the controller:

public function mentorias(){
    $mentorias = Mentoria::with('users')->get();
   echo $mentorias;
    


    return view('admin/mentorias/admin_mentorias', ['mentorias' => $mentorias]);
}

the output of the echo

[{"id":2,"titulo":"teste","titulo_en":"test","descricao":"fe","descricao_en":"ewfwe","created_at":"2021-12-28T01:32:10.000000Z","updated_at":"2021-12-28T01:32:10.000000Z","users":[]}]'

Since as i already said, i already used data from 2 tables with Many to Many relation, however with only 1 FK per PK, and it is working properly, i have no idea why it is not working this way . I already checked for similar questions, however with no luck

Thank You