<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\UnifiedRoleAssignmentScheduleRequest;
use Microsoft\Graph\Beta\Generated\Models\RequestSchedule;
use Microsoft\Graph\Beta\Generated\Models\ExpirationPattern;
use Microsoft\Graph\Beta\Generated\Models\ExpirationPatternType;
use Microsoft\Graph\Beta\Generated\Models\TicketInfo;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new UnifiedRoleAssignmentScheduleRequest();
$requestBody->setAction('SelfActivate');
$requestBody->setPrincipalId('c6ad1942-4afa-47f8-8d48-afb5d8d69d2f');
$requestBody->setRoleDefinitionId('9b895d92-2cd3-44c7-9d02-a6ac2d5ea5c3');
$requestBody->setDirectoryScopeId('/');
$requestBody->setJustification('Need to update app roles for selected apps.');
$scheduleInfo = new RequestSchedule();
$scheduleInfo->setStartDateTime(new \DateTime('2021-08-17T17:40:00.000Z'));
$scheduleInfoExpiration = new ExpirationPattern();
$scheduleInfoExpiration->setType(new ExpirationPatternType('afterDuration'));
$scheduleInfoExpiration->setDuration(new \DateInterval('PT5H'));
$scheduleInfo->setExpiration($scheduleInfoExpiration);
$requestBody->setScheduleInfo($scheduleInfo);
$ticketInfo = new TicketInfo();
$ticketInfo->setTicketNumber('CONTOSO:Normal-67890');
$ticketInfo->setTicketSystem('MS Project');
$requestBody->setTicketInfo($ticketInfo);
$result = $graphServiceClient->roleManagement()->directory()->roleAssignmentScheduleRequests()->post($requestBody)->wait();