Facebook OpenGraph GraphObject is returning empty object - php

Question

I'm trying to read ratings from a Facebook page to display externally, using the PHP SDK. I already have a long live access token, and have been able to use it to pull in the main page data, but when I try access the /ratings endpoint, I just receive back an empty Array ( )
class FacebookReviews
{
protected $session;
protected $page;
protected $ratings;
protected $appId;
protected $appSecret;
function __construct($appId = null, $appSecret = null)
{
session_start();
$this->appId = '123456789123456';
$this->appSecret = '1234567890abcdefghijklmnopqrstuv';
Facebook\FacebookSession::setDefaultApplication($this->appId, $this->appSecret);
$this->session = new Facebook\FacebookSession('LONG LIVE ACCESS TOKEN I GENERATED ON THE GRAPH API');
try {
$this->session->validate();
} catch (Facebook\FacebookRequestException $ex) {
// Session not valid, Graph API returned an exception with the reason.
echo $ex->getMessage();
} catch (\Exception $ex) {
// Graph API returned info, but it may mismatch the current app or have expired.
echo $ex->getMessage();
}
try {
$this->page = (new Facebook\FacebookRequest($this->session, 'GET', '/123456789123456/ratings'))->execute()->getGraphObject()->asArray();
} catch(Facebook\FacebookRequestException $e) {
echo "Exception occured, code: " . $e->getCode();
echo " with message: " . $e->getMessage();
}
}
public function result()
{
return $this->page;
}
}
$reviews = new FacebookReviews();
print_r($reviews->result());
If I remove /ratings from the request uri, it returns the data fine, but as I mentioned with it in there it doesn't work.
I generated the long live access token from my own account, which has admin access to the page