<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\AgentInstance;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new AgentInstance();
$additionalData = [
'agentCardManifest@odata.bind' => 'https://graph.microsoft.com/beta/agentRegistry/agentCardManifests(\'employee-assistant\')',
];
$requestBody->setAdditionalData($additionalData);
$result = $graphServiceClient->agentRegistry()->agentInstances()->byAgentInstanceId('agentInstance-id')->patch($requestBody)->wait();