How to display parent custom field in Views Shortcode for child post

Please discard previous message, I hadn't seen that the code was right there.
So this is the complete code, but it's still not working. Can you please point out any mistakes you see?

{% set args =  { post_type : "sessione-corso" , posts_per_page: -1, order : "DESC" } %}
{% set posts = mb.get_posts (args) %}
{% set currentDate = "now"|date("Y-m-d") %}
{% for post in posts %}

   

{% endfor %}
<ul>
{% for post in posts %}
      {# get the course catalog post #}
    {% set catalog_args = { post_type: 'catalogo-corso', relationship: { id: 'sessione-corso-a-catalogo', to: post.ID } } %}
    {% set catalog_posts = mb.get_posts( catalog_args ) %}
    {% for catalog_post in catalog_posts %}
        {% set covercorso = attribute( post, 'cover-corso' ) %}
    {# get the catalog post image and other info #}
        
    {% endfor %}
    {% set field = attribute( post, 'data-partenza-corso' ) %}
    {% set prezzo_associati = attribute( post, 'prezzo-associati' ) %}
    {% if field | date( 'Y-m-d' ) >= currentDate %}
       <div class="container">
            <div class="cardcorso">
                <div class="imagecorso">
                    <img src="{{ coverfoto.full_url }}" width="150" />
                    <div class="badge">€ {{ prezzo_associati }},00</div>
                </div>
                <div>
                    <h4>{{ post.title }}</h4>
                    Data Partenza:  <strong>{{ field | date( 'd-m-Y' ) }}</strong>
                    {% set field = attribute( post, 'calendario-corso' ) %}
                    <h5>CALENDARIO CORSO</h5>
                    <ul>
                        {% for clone in field %}
                        <li> {{ clone | date( 'd-m-Y' ) }}</li>
                        {% endfor %}
                    </ul>
                </div>
            </div>
        </div>
        
    {% endif %}
{% endfor%} 
</ul>

If possible I would like to get to the bottom of this with your help, because it's in my opinion a crucial step on the path to learning to use METABOX to its full capacity.
So I corrected all the errors you pointed out, double checking names and slugs.
Recapping:
Course Catalog Slug : corso
Relationship Slug : sessione-corso-a-catalogo
Course Session Slug : sessione-corso

Now my view code is :

{% set args = { post_type : "sessione-corso" , posts_per_page: -1, order : "DESC" } %}
{% set posts = mb.get_posts (args) %}
{% set currentDate = "now"|date("Y-m-d") %}

Still it is not showing neither the "cover_corso" as image nor the duration of the course {{ duratacorso }}

If I inspect the page I see this:
html code where the image should be ->
html code where the course duration should be=> <p></p>

So it seems that the second query is not targeting anything. Please tell me what I am doing wrong
or what should I check for errors.
Thank you!