<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\ScopedRoleMembership;
use Microsoft\Graph\Generated\Models\Identity;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new ScopedRoleMembership();
$requestBody->setRoleId('roleId-value');
$roleMemberInfo = new Identity();
$roleMemberInfo->setId('id-value');
$requestBody->setRoleMemberInfo($roleMemberInfo);
$result = $graphServiceClient->directory()->administrativeUnits()->byAdministrativeUnitId('administrativeUnit-id')->scopedRoleMembers()->post($requestBody)->wait();