Add tag on page coding

Hello,

I use following code to add tag on page (child function.php). It shows in admin setting, but doesn’t shows on page. Can someone correct me?

// add tag support to pages
function tags_support_all() {
register_taxonomy_for_object_type(‘post_tag’, ‘page’);
}

// ensure all tags are included in queries
function tags_support_query($wp_query) {
if ($wp_query->get(‘tag’)) $wp_query->set(‘post_type’, ‘any’);
}

// tag hooks
add_action(‘init’, ‘tags_support_all’);
add_action(‘pre_get_posts’, ‘tags_support_query’);

Please help. Thanks in advance!