WooCommerce - add extra checkout fields to WooCommerce emails

gistfile1.php

<?php
/**
 * Add the field to order emails
 **/
add_filter('woocommerce_email_order_meta_keys', 'my_custom_checkout_field_order_meta_keys');
 
function my_custom_checkout_field_order_meta_keys( $keys ) {
	$keys[] = 'My Field 1';
	$keys[] = 'My Field 2';
	return $keys;
}

I would adjust this to:

/**
 * Add the field to order emails
 **/
add_filter('woocommerce_email_order_meta_keys', 'my_custom_checkout_field_order_meta_keys');

function my_custom_checkout_field_order_meta_keys( $keys ) {
    $keys['My Field 1'] = '_my_field_1;
    $keys['My Field 2'] = '_my_field_2';
    return $keys;
}

As this produces a more readable result:

My Field 1: Some value
My Field 2: Another value

instead of

_my_field_1: Some value
_my_field_2: Another value

Are there any version requirements for this? I'm running on 2.1.12 and my custom fields are not coming over in the email.

I have the same problem. Does not receive the cutom fields in the email.

It is so good to know I'm not the only one who cannot get this to work. I've been thinking I'm going nuts for the last hour.

Hello everybody ! I found this post on Github https://gist.github.com/ChromeOrange/3905785 and it solved my problem: my custom fields are now displaying in the email. I just needed to leave the key empty: $keys[]