<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\CountryNamedLocation;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new CountryNamedLocation();
$requestBody->setOdataType('#microsoft.graph.countryNamedLocation');
$requestBody->setDisplayName('Named location with unknown countries and regions');
$requestBody->setCountriesAndRegions(['US', 'GB', ]);
$requestBody->setIncludeUnknownCountriesAndRegions(true);
$result = $graphServiceClient->identity()->conditionalAccess()->namedLocations()->post($requestBody)->wait();