Remove any product coupons from products in the cart, that have a recurring scheme applied to it from All Products for WooCommerce Subscriptions

exclude_recurring_from_coupons.php

<?php

// Set the product discount amount to zero if it has a recurring scheme

add_filter( 'woocommerce_coupon_get_discount_amount', 'zero_discount_for_excluded_products', 12, 5 );

function zero_discount_for_excluded_products( $discount, $discounting_amount, $cart_item, $single, $coupon ){

  if ( false != ( $cart_item[ 'wcsatt_data' ][ 'active_subscription_scheme' ] ) ) 
    $discount = 0;

    return $discount;

}