Microsoft Graph Api displays insufficient privileges to complete the operation - azure-active-directory

Question

I have an admin account that am trying to update its data using microsoft Graph API via php Curl but its showing error:
{
"error": {
"code": "Authorization_RequestDenied",
"message": "Insufficient privileges to complete the operation.",
"innerError": {
"request-id": "110ac3f6-16d1-41a2-b2dc-add954514666",
"date": "2017-12-04T00:12:02"
}
}
}
below is the code for updating
<?php
session_start();
echo $acc= $_SESSION['access_token'];
$data_string = array("jobTitle" => 'Fibre ngineer', "officeLocation" => "SAMOLA");
$data = json_encode($data_string);
//$data = $data_string;
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => "https://graph.microsoft.com/v1.0/users/#mydata.onmicrosoft.com",
//CURLOPT_URL => "https://graph.microsoft.com/v1.0/me",
CURLOPT_HEADER => true,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
//curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'PATCH');
CURLOPT_CUSTOMREQUEST => "PATCH",
CURLOPT_POSTFIELDS => "$data",
CURLOPT_HTTPHEADER => array(
"accept: application/json",
"authorization: Bearer $acc",
"content-type: application/json; charset=utf-8"
),
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
print_r($response);
$json = json_decode($response);
if ($err) {
echo "cURL Error #:" . $err;
} else {
//echo $response;
}
?>
I have also set all the required permission like Directory and Users read access but cannot get it to work