admin_notices don’t appear for vendors

I have admin_notices working fine to all users EXCEPT vendors. I am using 2 different well-documented methods below), but neither appear for Vendors (say, on their edit products page); otherhwise the code below works fine.

function admin_notice() {
    $screen = get_current_screen();
    // Only render this notice in the post editor.
    //if ( ! $screen || 'post' !== $screen->base ) {
    //    return;
    //}
    // Render the notice's HTML.
    // Each notice should be wrapped in a <div>
    // with a 'notice' class.
    $type = get_post_type();
    if ($type == 'product') {
    echo '<div class="notice notice-success is-dismissible"><p>';
    echo sprintf( __( 'Your WP install now has a custom plugin. <a href="/wp-admin/index.php" target="_blank">There are now 2 &apos;WoodMtn.com Custom Plugin&apos; panels on the Dashboard.</a>' ), get_preview_post_link() );
    echo '</p></div>';
    $screen = get_current_screen();
    // Only render this notice in the post editor.
    if ( ! $screen || 'post' !== $screen->base ) {
        return;
    }
    // Render the notice's HTML.
    // Each notice should be wrapped in a <div>
    // with a 'notice' class.
    echo '<div class="notice notice-success is-dismissible"><p>';
    echo sprintf( __( 'Post draft updated. <a href="%s" target="_blank">Preview post</a>' ), get_preview_post_link() );
    echo '</p></div>';
    }
}

Any suggestions as to what I should try?? These ‘net naive’ vendors will need some help at some crucial points and I need to print admin-notices to them. I should note that some admin-notices such as ‘product saved OK’ appear just fine and I need to match that function/use of privs for Vendors.