<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\Group;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new Group();
$requestBody->setOdataType('#microsoft.graph.group');
$requestBody->setDescription('Self help community for golf');
$requestBody->setDisplayName('Golf Assist');
$requestBody->setGroupTypes(['Unified', ]);
$requestBody->setMailEnabled(true);
$requestBody->setMailNickname('golfassist');
$requestBody->setSecurityEnabled(false);
$result = $graphServiceClient->directory()->administrativeUnits()->byAdministrativeUnitId('administrativeUnit-id')->members()->post($requestBody)->wait();