Append the product name of the subscription to the ID in the My Account area.

append-product-name.php

<?php

/* 
* Adds subscription name, with link to the product page, beside subscription ID in My Account > Subscriptions
*/

add_action( 'woocommerce_my_subscriptions_after_subscription_id', 'wcs_add_subscription_name_to_table', 35 );
function wcs_add_subscription_name_to_table( $subscription ) {

    foreach ( $subscription->get_items() as $item_id => $item ) {
	    
        $_product  = apply_filters( 'woocommerce_subscriptions_order_item_product', $subscription->get_product_from_item( $item ), $item );

        if ( apply_filters( 'woocommerce_order_item_visible', true, $item ) ) {

            echo wp_kses_post( apply_filters( 'woocommerce_order_item_name', sprintf( '<a href="%s">%s</a>', get_permalink( $item['product_id'] ), $item['name'] ), $item ) );

        }
        
    }
}