<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Users\Item\Messages\Item\MessageItemRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new MessageItemRequestBuilderGetRequestConfiguration();
$queryParameters = MessageItemRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->expand = ["singleValueExtendedProperties(\$filter=id eq 'String {66f5a359-4659-4830-9070-00047ec6ac6e} Name Color')"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->me()->messages()->byMessageId('message-id')->get($requestConfiguration)->wait();