tracking number field in Woocommerce order [closed]

The syntax to get your custom field is:

get_post_meta($post_id, $key, $single);

In your context, you should try:

$tracking_id = get_post_meta($order->get_order_number(), 'Tracking_ID', true);

To show you in your example:

<?php /* translators: %s: Site title */ 
$tracking_id = get_post_meta($order->get_order_number(), 'Tracking_ID', true); ?>
<p><?php printf( esc_html__( 'Your %s order is completed. Your tracking number is: %s', 'woocommerce' ), esc_html( wp_specialchars_decode( get_option( 'blogname' ), esc_html($tracking_id) ) ) ); ?></p>

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