Error seranking – Faltan enlaces de confirmación (retorno) en las páginas de hreflang

//Añadir links alternate a las páginas que no son single

function relateEs(){
	global $wp_query;
	global $sitepress;
	$url = add_query_arg( NULL, NULL );
	echo "<link rel='alternate' href='https://eli1957.com$url' hreflang='x-default'/>\n";
	if(get_locale() == 'es_ES'){
		$sitepress->switch_lang('en');
		if( is_single() ){
			$wpml_permalink = get_permalink(icl_object_id($wp_query->post->ID,'page',false));
			echo "<link rel='alternate' href='$wpml_permalink' hreflang='en'/>\n";
		}elseif( is_archive() ) {
			$page_id = get_queried_object_id();
			$wpml_permalink = get_category_link( icl_object_id( $page_id , 'category' , true , 'en' ) );
			echo "<link rel='alternate' href='$wpml_permalink' hreflang='en'/>\n";
		}else{
			echo "<link rel='alternate' href='https://eli1957.com/blog/en' hreflang='en'/>\n";
		}
		$sitepress->switch_lang('es');
	}else{
		$sitepress->switch_lang('es');
		if( is_single() ){
			$wpml_permalink = get_permalink(icl_object_id($wp_query->post->ID,'page',false));
			echo "<link rel='alternate' href='$wpml_permalink' hreflang='es'/>\n";
		}elseif( is_archive() ){
			$page_id = get_queried_object_id();
			$wpml_permalink = get_category_link( icl_object_id( $page_id , 'category' , true , 'es' ) );
			echo "<link rel='alternate' href='$wpml_permalink' hreflang='es'/>\n";
		}else{
			echo "<link rel='alternate' href='https://eli1957.com/blog/' hreflang='es'/>\n";
		}
		$sitepress->switch_lang('en');
	}
}

add_filter( 'wp_head', 'relateEs', 9999 );