<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Teams\Item\InstalledApps\InstalledAppsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new InstalledAppsRequestBuilderGetRequestConfiguration();
$queryParameters = InstalledAppsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->expand = ["teamsAppDefinition"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->teams()->byTeamId('team-id')->installedApps()->get($requestConfiguration)->wait();