Laravel strange behavior with eloquent models

I know that this question may be duplicated, but no current solution helped me to figure out the problem !

I have 2 models: User and Account, where user can have multiple accounts, but an account should belong to only one user.
Here the relations in the models:
In User:

class User extends Model {
  public $table = 'users';
  public function accounts()
  {
    return $this->hasMany(Account::class, 'user_id');
  }
}

In Account:

class Account extends Model {
  public $table = 'accounts';
  public function user()
  {
    return $this->belongsTo(User::class,'user_id','id');
  }
}

When I do User::find(1) it returns null, despite I have a user in my database with the id 1.
The same Problem when I do Account::find(1)->user it returns null, but Account::find(1) works fine.

Any solution?

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