This code will disable coupon on cart if it’s already applied.

//Disable coupon on cart if already exists
add_filter( 'woocommerce_coupons_enabled', 'woocommerce_coupons_enabled_checkout' );
function woocommerce_coupons_enabled_checkout( $coupons_enabled ) {
  
    global $woocommerce;
    
    if ( ! empty( $woocommerce->cart->applied_coupons ) ) {
		remove_action( 'woocommerce_before_checkout_form', 'woocommerce_checkout_coupon_form', 10 );
        return false;

    }
    return $coupons_enabled;
}

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