ContactFolder を作成する　

POST https://graph.microsoft.com/beta/me/contactFolders/{id}/childFolders
Content-type: application/json

{
  "displayName": "Family"
}

// Code snippets are only available for the latest version. Current version is 5.x

// Dependencies
using Microsoft.Graph.Beta.Models;

var requestBody = new ContactFolder
{
	DisplayName = "Family",
};

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
var result = await graphClient.Me.ContactFolders["{contactFolder-id}"].ChildFolders.PostAsync(requestBody);

// Code snippets are only available for the latest major version. Current major version is $v0.*

// Dependencies
import (
	  "context"
	  msgraphsdk "github.com/microsoftgraph/msgraph-beta-sdk-go"
	  graphmodels "github.com/microsoftgraph/msgraph-beta-sdk-go/models"
	  //other-imports
)

requestBody := graphmodels.NewContactFolder()
displayName := "Family"
requestBody.SetDisplayName(&displayName) 

// To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=go
childFolders, err := graphClient.Me().ContactFolders().ByContactFolderId("contactFolder-id").ChildFolders().Post(context.Background(), requestBody, nil)

// Code snippets are only available for the latest version. Current version is 6.x

GraphServiceClient graphClient = new GraphServiceClient(requestAdapter);

ContactFolder contactFolder = new ContactFolder();
contactFolder.setDisplayName("Family");
ContactFolder result = graphClient.me().contactFolders().byContactFolderId("{contactFolder-id}").childFolders().post(contactFolder);

const options = {
	authProvider,
};

const client = Client.init(options);

const contactFolder = {
  displayName: 'Family'
};

await client.api('/me/contactFolders/{id}/childFolders')
	.version('beta')
	.post(contactFolder);

<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\ContactFolder;


$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);

$requestBody = new ContactFolder();
$requestBody->setDisplayName('Family');

$result = $graphServiceClient->me()->contactFolders()->byContactFolderId('contactFolder-id')->childFolders()->post($requestBody)->wait();

Import-Module Microsoft.Graph.Beta.PersonalContacts

$params = @{
	displayName = "Family"
}

# A UPN can also be used as -UserId.
New-MgBetaUserContactFolderChildFolder -UserId $userId -ContactFolderId $contactFolderId -BodyParameter $params

# Code snippets are only available for the latest version. Current version is 1.x
from msgraph_beta import GraphServiceClient
from msgraph_beta.generated.models.contact_folder import ContactFolder
# To initialize your graph_client, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=python
request_body = ContactFolder(
	display_name = "Family",
)

result = await graph_client.me.contact_folders.by_contact_folder_id('contactFolder-id').child_folders.post(request_body)