<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Users\Item\Teamwork\InstalledApps\Item\UserScopeTeamsAppInstallationItemRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new UserScopeTeamsAppInstallationItemRequestBuilderGetRequestConfiguration();
$queryParameters = UserScopeTeamsAppInstallationItemRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->expand = ["teamsAppDefinition"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->users()->byUserId('user-id')->teamwork()->installedApps()->byUserScopeTeamsAppInstallationId('userScopeTeamsAppInstallation-id')->get($requestConfiguration)->wait();