<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Drives\Item\Items\Item\Workbook\Names\Item\Range\UsedRange\UsedRange()GetRequestBody;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new UsedRange()GetRequestBody();
$additionalData = [
'valuesOnly' => true,
];
$requestBody->setAdditionalData($additionalData);
$result = $graphServiceClient->drives()->byDriveId('drive-id')->items()->byDriveItemId('driveItem-id')->workbook()->names()->byWorkbookNamedItemId('workbookNamedItem-id')->range()->usedRange()->get($requestBody)->wait();