Progammatically set expiration does not work

I have followed thesteps on this page:

https://publishpress.com/knowledge-base/technical-details/

in the section entitled “How to schedule expirations programmatically”.

The result is that the Category to expire to does not get checked.
https://ibb.co/GvMkq99

My code:

function expire_product($postID, $session_date, $studio_id) {

// From the session_date, set the Expiration Date as 45 minutes afterwards.
$expiration_date = $session_date->modify('+45 minutes');
$expiration_date->modify('-10 hours'); // Seems to be out by 10 hours
$expiration_date_str = $expiration_date->format('Y-m-d H:i:s');
// Get the Product Category ID from the studio id
$past_categoryId = intval(get_user_meta($studio_id, 'champ_franchisee_categories_past', true));
if (function_exists('postExpirator_init')) {

$options = [
'expireType' => 'category',
'id' => $postID,
        'category' => $past_categoryId,
        'categoryTaxonomy' => 'product_cat'
        
];

$timeStamp = date('U', strtotime($expiration_date_str));

$tempstr=date('d/m/Y H:i:s', $timeStamp);
_scheduleExpiratorEvent($postID, $timeStamp, $options);
}
}