Yoast SEO and Custom fields metabox

Hi,

Can you please share the code that you use to create the custom field? I've tested that feature again and it works as well on my end. For example:

add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );
function your_prefix_function_name( $meta_boxes ) {
    $meta_boxes[] = [
        'title'  => __( 'Post Meta', 'your-text-domain' ),
        'id'     => 'post-meta',
        'fields' => [
            [
                'name'                  => __( 'Wysiwyg', 'your-text-domain' ),
                'id'                    => $prefix . 'wysiwyg',
                'type'                  => 'wysiwyg',
                'add_to_wpseo_analysis' => true,
            ],
        ],
    ];

    return $meta_boxes;
}

Then add the code to the Yoast SEO settings %%cf_wysiwyg%%
screenshot: https://share.getcloudapp.com/8Lu9nDYo