Preset attributes in product entry

When a Vendor inserts a product I need a certain attribute to be automatically set with a default value. As Admin, with the standard woocommerce entry form, I easily solved it with this code in functions.php

function make_product_attribute($name) {
    global $wc_product_attributes;
    if ( isset($wc_product_attributes[$name]) ){
        $newattr = new WC_Product_Attribute();
        $newattr->set_id(1);  //any positive value is interpreted as is_taxonomy=true
        $newattr->set_name($name);
        $newattr->set_visible(true);
        $newattr->set_variation(true);
        //example of setting default value for item
        if ($name=='pa_condizione'){
            $terms = get_terms("pa_condizione");
            foreach ($terms as $term) {
                $term = get_term_by('slug', $term->name, $name);
            }
            $newattr->set_options(array(1452)); //Global attribute term IDs previously added from Products->Attributes
        }
        return $newattr;
    } else {
        return false;
    }
}

function default_product_attributes() {
    global $product;
    if (! $product) {
        $product = $GLOBALS['product_object'];
    }
    if (! $product) {
        return;
    }
    $attributes = $product->get_attributes();
    
    $defaultAttributes = array(
        'pa_condizione'
    );
    
    $changed=false;
    foreach ($defaultAttributes as $key){
        if (! isset($attributes[$key])){
            $newattr = make_product_attribute($key);
            if ($newattr){
                $attributes[$key] = $newattr;
            }
            $changed = true;
        }
    }
    if ($changed){
        $product->set_attributes($attributes);
    }
}
add_action('woocommerce_product_write_panel_tabs', 'default_product_attributes');

From the vendor dashboard however it doesn’t work. How could I integrate this function for Vendors as well?

Thanks for any help.