<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Solutions\BackupRestore\ProtectionPolicies\Item\ProtectionPolicyBaseItemRequestBuilderDeleteRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new ProtectionPolicyBaseItemRequestBuilderDeleteRequestConfiguration();
$headers = [
'Authorization' => 'Bearer <Access-Token>',
];
$requestConfiguration->headers = $headers;
$graphServiceClient->solutions()->backupRestore()->protectionPolicies()->byProtectionPolicyBaseId('protectionPolicyBase-id')->delete($requestConfiguration)->wait();