I want to make a child component that takes the formGroup and adds validations but I receive an error because the child component does not perceive that it is inside the parent's "form"

How could I solve this problem?

father component:

```
<form [formGroup]="formulario">
    <app-campo [(propiedad)]="usuario.correo"
                               placeholder="title"
                               email="true"
                               [(formulario)]="formulario"
                    ></app-campo>
  </form>

```

child component:

```
<h3>Label</h3>
    <input
           placeholder="{{placeholder}}"
           [(ngModel)]="valorPropiedad"
           name="campo"
           (ngModelChange)="cambiar($event)"
           formControlName="campo"
           type="{{tipoInput}}">

```

<https://plnkr.co/edit/iyvemjyYAq6hY4jzHihu?p=preview>