Send the customer invoice to multiple email addresses

functions.php

<?php
add_filter( 'woocommerce_email_recipient_customer_invoice', 'wc_send_invoice_multiple_addresses' );
function wc_send_invoice_multiple_addresses( $recipient ) {
  $recipient  = rtrim( trim( $recipient ), ',' );
  
  $new_recipients = array(
    'yourmeail@domain.com',
    'onemore@anotherdomain.com',
    //Add more email addresses if needed
  );
  
  $recipient .= ',' . implode( ',', $new_recipients );
  
  return $recipient;
}