<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\CertificateAuthorityDetail;
use Microsoft\Graph\Generated\Models\CertificateAuthorityType;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new CertificateAuthorityDetail();
$requestBody->setCertificateAuthorityType(new CertificateAuthorityType('intermediate'));
$result = $graphServiceClient->directory()->publicKeyInfrastructure()->certificateBasedAuthConfigurations()->byCertificateBasedAuthPkiId('certificateBasedAuthPki-id')->certificateAuthorities()->post($requestBody)->wait();