Social Share in Multiple Custom Post

Hi!
I try to use this to display the social share toolbar in multiple custom post made with ALB, but it seems not working. any advice ?
ty

add_filter('avf_template_builder_content', 'avia_add_social_toolbar_template_builder', 10, 1);
function avia_add_social_toolbar_template_builder($content = "")
{
    if(is_singular( array( 'ricette', 'ricettesenzaglutine' ) ){
	$content .= avia_social_share_links(array(), false);
	$content .= '<div style="height:1px; margin-top:50px;" class="hr"></div>';
	}
	return $content;
}