<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\AccessPackageAssignmentRequest;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new AccessPackageAssignmentRequest();
$requestBody->setRequestType('adminRemove');
$additionalData = [
'assignment' => [
'id' => 'a6bb6942-3ae1-4259-9908-0133aaee9377',
],
];
$requestBody->setAdditionalData($additionalData);
$result = $graphServiceClient->identityGovernance()->entitlementManagement()->assignmentRequests()->post($requestBody)->wait();