<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\HomeRealmDiscoveryPolicy;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new HomeRealmDiscoveryPolicy();
$requestBody->setDefinition(['{\"HomeRealmDiscoveryPolicy\":{\"AccelerateToFederatedDomain\":true,\"PreferredDomain\":\"federated.example.edu\",\"AlternateIdLogin\":{\"Enabled\":true}}}', ]);
$requestBody->setDisplayName('Contoso default HRD Policy');
$result = $graphServiceClient->policies()->homeRealmDiscoveryPolicies()->byHomeRealmDiscoveryPolicyId('homeRealmDiscoveryPolicy-id')->patch($requestBody)->wait();