CC an email address on the 'cancel_admin' email PMPro sends out.

cc-pmpro-admin-email-cancel.php

<?php
/**
 * CC an email address on the 'cancel_admin' email PMPro sends out.
 * Add this code to your site by following - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_email_headers_admin_cancel_emails($headers, $email) {		
	//cc emails already going to admin_email
        if( $email->template == 'cancel_admin' ) {
		//add cc
		$headers[] = 'CC:' . '[email protected]'; // type in your email address here please.
	}
 
	return $headers;
}

add_filter('pmpro_email_headers', 'my_pmpro_email_headers_admin_cancel_emails', 10, 2);