<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\DeviceManagement\VirtualEndpoint\ProvisioningPolicies\Item\Apply\ApplyPostRequestBody;
use Microsoft\Graph\Beta\Generated\Models\CloudPcPolicySettingType;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new ApplyPostRequestBody();
$requestBody->setPolicySettings(new CloudPcPolicySettingType('region'));
$requestBody->setReservePercentage(80);
$graphServiceClient->deviceManagement()->virtualEndpoint()->provisioningPolicies()->byCloudPcProvisioningPolicyId('cloudPcProvisioningPolicy-id')->apply()->post($requestBody)->wait();