<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Chats\Item\PinnedMessages\PinnedMessagesRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new PinnedMessagesRequestBuilderGetRequestConfiguration();
$queryParameters = PinnedMessagesRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->expand = ["message"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->chats()->byChatId('chat-id')->pinnedMessages()->get($requestConfiguration)->wait();