<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\RemoteDesktopSecurityConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new RemoteDesktopSecurityConfiguration();
$requestBody->setOdataType('#microsoft.graph.remoteDesktopSecurityConfiguration');
$requestBody->setIsRemoteDesktopProtocolEnabled(true);
$result = $graphServiceClient->servicePrincipals()->byServicePrincipalId('servicePrincipal-id')->remoteDesktopSecurityConfiguration()->patch($requestBody)->wait();