Accounts are not linking

Hi,

I am using PHP library after using OAUTH  i am getting this response 

stdClass Object
	(
	[access_token] => ya29.Ci8LA6IBQkPj4MFFcimzAyFUBjl-Ve6TPe_kE_n59l4kW3Xjw_QLEWTqMDPeeYl1Ig
	[token_type] => Bearer
	[expires_in] => 3600
	[refresh_token] => 1/79G4Whk7m1Qv9BLMC5_bOtYwVJEO1N_4Y1j-cXN-p9U
Now after Authentication	) i want to add that account in my MCC account right now i m using MCC test account.   this is my code for linking

 

$managedCustomerService =

                $user->GetService('ManagedCustomerService', 'v201603');

            // Create customer.

            $customerService = $user->GetService("CustomerService");

                         

            $cust = $customerService->get();

$linkOperations =array();

            $managecustomerlink =  new ManagedCustomerLink();

            $managecustomerlink->managerCustomerId = xxxxxxxxxx; // Mcc manager customer id

            $managecustomerlink->clientCustomerId=$customer->customerId; user which is logined by oauth

            $managecustomerlink->linkStatus='PENDING';

            $linkOperation = new LinkOperation();

            $linkOperation->operator = 'ADD' ;

            $linkOperation->operand = $managecustomerlink ;

            $linkOperations = array($linkOperation);

//            print_r($linkOperations);

//            exit;

           // $managedCustomerService->mutateLink($linkOperations);

            try{

            $result = $managedCustomerService->mutateLink( $linkOperations );

            } catch (Exception $e) {

            $message = $e->getMessage();

            $this->errors[] = $message;

            return FALSE;

        }

i m getting this error

[ManagedCustomerServiceError.NOT_AUTHORIZED @ operations[0]]

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