divi breadcrumbs not working in header.php

Hi,

I’ve inserted the code into the bottom of the child theme header.php file as follows but the breadcrumbs no not appear. Here’s the snippet of the last few lines:


<div id="et-main-area">
<?php if (function_exists('rank_math_the_breadcrumbs') && !is_home() && !is_front_page()) rank_math_the_breadcrumbs(); ?>
<?php
/**
* Fires after the header, before the main content is output.
*
* @since 3.10
*/
do_action( 'et_before_main_content' );


Can you please advise how to get this to work correctly?
Thanks