<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\AccessPackageAssignmentRequest;
use Microsoft\Graph\Generated\Models\AccessPackageRequestType;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new AccessPackageAssignmentRequest();
$requestBody->setRequestType(new AccessPackageRequestType('userAdd'));
$requestBody->setJustification('Need access to New Hire access package');
$additionalData = [
'accessPackageAssignment' => [
'accessPackageId' => 'a914b616-e04e-476b-aa37-91038f0b165b',
],
];
$requestBody->setAdditionalData($additionalData);
$result = $graphServiceClient->identityGovernance()->entitlementManagement()->assignmentRequests()->post($requestBody)->wait();