Upsell on mini-cart not working

Hi, I tried adding upsell offer shortcode to mini-cart by adding this code to child theme functions.php however products do appear but I cannot click on + icon top right to add the upsale product to the cart. How can we fix this?

/* upsell on mini cart */
add_action( 'woocommerce_mini_cart_contents', 'upsell_minicart' );
 
function upsell_minicart() {
    echo '<div style="padding: 15px;">';
	echo do_shortcode( '[wpcuf_uf]' );
	echo '</div>';
}