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  • For some reason the code did not work. I did find the following code that did work.

    add_action('acf/save_post', 'flex_FeaturedImageSetByACF', 50);
    
    function flex_FeaturedImageSetByACF() {
    
        $current_screen         = get_current_screen(); // Current admin screen needed to identify the current cpt
        $current_cpt_name       = 'models'; // Current cpt name
        $current_cpt_support    = 'thumbnail'; // We want to check if the CPT supports this feature
    
        global $post;
    
        $post_id                = ( $post->ID ); // Current post ID
        $post_gallery_field     = get_field('model_gallery', $post_id ); // ACF field
    
        if  ( !empty( $post_id ) ) {
    
            if ( isset( $post_gallery_field['0'] ) ) {
    
                $post_image_id          = $post_gallery_field['0']['id']; // ACF image filed ID
                $post_image_url         = $post_gallery_field['0']['url']; // ACF image filed URL
    
                // If current cpt supports thumbnails/featured images
    
                if ( post_type_supports( $current_cpt_name, $current_cpt_support ) ) {
    
                    if ( ( $post_image_url ) AND ( ( $post_image_url ) != ( get_the_post_thumbnail() ) ) ) {
    
                        update_post_meta($post_id, '_thumbnail_id', $post_image_id);
    
                    }
    
                }
    
            } else {
    
                update_post_meta( $post_id, '_thumbnail_id', 0 );
    
            }
    
        }
    
    }