<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\IdentityGovernance\Task;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new Task();
$requestBody->setDescription('Add user to selected groups');
$requestBody->setDisplayName('Update marketing day 1 add users to Group set up');
$result = $graphServiceClient->identityGovernance()->lifecycleWorkflows()->workflows()->byWorkflowId('workflow-id')->tasks()->byTaskId('task-id')->patch($requestBody)->wait();