InvoiceCreated hook not firing

[Antonio Gil]

Hello, I am having trouble developing an addon because this trigger seems its not being fired. In the Hook debug activity log looks like the hook is detected.

My code in hooks.php.

<?php

if (!defined("WHMCS")) {
    die("This file cannot be accessed directly");
}

add_hook('InvoiceCreated', 10, function ($params) {


    localAPI( 'LogActivity', array(
        'description' => "Triggered: InvoiceCreated"
    ));

});

What can be the problem?