Not being logged out of auth0 at all

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I have tried this already and it doesn’t appear to work, I can still called getUser and return a user after I have hit the log out script.

logout.php

use Auth0\SDK\Auth0;

/** @noinspection PhpUnhandledExceptionInspection*/
$auth0 = new Auth0([
	'domain' => AUTH0_DOMAIN,
	'client_id' => AUTH0_CLIENT_ID,
	'client_secret' => AUTH0_CLIENT_SECRET,
	'redirect_uri' => "http://{$_SERVER['HTTP_HOST']}/dealer_interface_login.php"
]);

$auth0->logout();
$return_to = DMS_URL.'/dealer_interface_login.php';
$logout_url = sprintf('http://%s/v2/logout?client_id=%s&returnTo=%s&federated', AUTH0_DOMAIN, AUTH0_CLIENT_ID, $return_to);
header('Location: ' . $logout_url);