<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\Security\EmailThreatSubmissionPolicy;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new EmailThreatSubmissionPolicy();
$requestBody->setIsReportToMicrosoftEnabled(false);
$result = $graphServiceClient->security()->threatSubmission()->emailThreatSubmissionPolicies()->byEmailThreatSubmissionPolicyId('emailThreatSubmissionPolicy-id')->patch($requestBody)->wait();