<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\AccessPackageAssignmentRequest;
use Microsoft\Graph\Generated\Models\AccessPackageRequestType;
use Microsoft\Graph\Generated\Models\AccessPackageAssignment;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new AccessPackageAssignmentRequest();
$requestBody->setRequestType(new AccessPackageRequestType('adminAdd'));
$assignment = new AccessPackageAssignment();
$additionalData = [
'targetId' => '46184453-e63b-4f20-86c2-c557ed5d5df9',
'assignmentPolicyId' => '2264bf65-76ba-417b-a27d-54d291f0cbc8',
'accessPackageId' => 'a914b616-e04e-476b-aa37-91038f0b165b',
];
$assignment->setAdditionalData($additionalData);
$requestBody->setAssignment($assignment);
$result = $graphServiceClient->identityGovernance()->entitlementManagement()->assignmentRequests()->post($requestBody)->wait();