<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\AccessPackageAssignmentRequest;
use Microsoft\Graph\Beta\Generated\Models\AccessPackageAssignment;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new AccessPackageAssignmentRequest();
$requestBody->setRequestType('AdminAdd');
$accessPackageAssignment = new AccessPackageAssignment();
$accessPackageAssignment->setTargetId('46184453-e63b-4f20-86c2-c557ed5d5df9');
$accessPackageAssignment->setAssignmentPolicyId('2264bf65-76ba-417b-a27d-54d291f0cbc8');
$accessPackageAssignment->setAccessPackageId('a914b616-e04e-476b-aa37-91038f0b165b');
$requestBody->setAccessPackageAssignment($accessPackageAssignment);
$result = $graphServiceClient->identityGovernance()->entitlementManagement()->accessPackageAssignmentRequests()->post($requestBody)->wait();