Displays a field with another $post_id

I have a custom field in the PRODOTTI post type

$meta_boxes[] = array(
  'title'      => esc_html__( 'Link Stripe', 'scadenza' ),
  'post_types' => array('prodotti'), // <- post-type PRODOTTI 

  'fields' => array(
    array(
      'name'        => 'Link Stripe',
      'id'          => 'stripeUrl',
      'type'        => 'text',
    ),
  )
);

In a single post of the DOMINI post type I recall a post from PRODOTTI with type=>post

$meta_boxes[] = array(
  'title'      => esc_html__( 'Prodotto', 'scadenza' ),
  'post_types' => array('domini'), // <- post-type DOMINI

  'fields' => array(
    array(
      'name'        => 'Prodotto singolo',
      'id'          => 'prodotto_singolo',
      'type'        => 'post', // <- type POST

      // Post type.
      'post_type'   => 'prodotti',

      // Field type.
      'field_type'  => 'select_advanced',
    ),

  )
    
);

I want to display the value of the 'stripeUrl' field and use this code

$prodotto = rwmb_meta( 'prodotto_singolo', $post_id );
if ( $prodotto ) {
  $stripeUrl = rwmb_meta( 'stripeUrl', $prodotto );
}

First I load the ID of the 'prodotto_singolo' field and then I want to load the 'stripeUrl' value using $prodotto like $post_id, but no value is displayed.

Where am I wrong?