<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Organization\Item\Branding\BrandingRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new BrandingRequestBuilderGetRequestConfiguration();
$headers = [
'Accept-Language' => 'fr-FR',
];
$requestConfiguration->headers = $headers;
$result = $graphServiceClient->organization()->byOrganizationId('organization-id')->branding()->get($requestConfiguration)->wait();