MSGraph Powershell New-MgDriveItemChild

I'm trying to use the Microsoft Graph Powershell module to create a a folder in a Sharepoint site's drive.

Looking at the documentation here I should be able to do the following:

Import-Module Microsoft.Graph.Files

$params = @{
    name = "New Folder"
    folder = @{
    }
    "@microsoft.graph.conflictBehavior" = "rename"
}

New-MgDriveItemChild -DriveId $driveId -DriveItemId $driveItemId -BodyParameter $params

However, this is giving me an error:

New-MgDriveItemChild_Create: You must provide either a file facet if creating a file or a folder facet if creating a folder or a remoteItem facet if adding a shared folder

Status: 400 (BadRequest)
ErrorCode: invalidRequest
Date: 2023-11-23T17:50:50

I have got the driveitem ID of the subfolder from the site's shared drive but it will not create the folder? I can use postman ok to create the folder directly via the API, but Powershell doesn't seem to like it.

Maybe my misunderstanding, but what is meant by a folder facet?

The error occurs if missed including folder facet while creating folder using Microsoft Graph PowerShell modules.

When I ran your script to create new folder without defining folder facet, I too same error as below:

Import-Module Microsoft.Graph.Files

$params = @{
    name = "New Folder"
    folder = @{
    }
    "@microsoft.graph.conflictBehavior" = "rename"
}

$driveId = "xxxxxxx"
$driveItemId = "xxxxxxxx"

New-MgDriveItemChild -DriveId $driveId -DriveItemId $driveItemId -BodyParameter $params

Response:

To resolve the error, you need to define at least one folder property like childCount or view or any property in the request body while creating folder with New-MgDriveItemChild cmdlet.

When I ran below modified PowerShell script by including folder facet, I got response like this:

Import-Module Microsoft.Graph.Files

$params = @{
    name = "New Folder"
    folder = @{
        "childCount" = 1024
        "view" = @{
            "@odata.type" = "microsoft.graph.folderView"
        }
    }
    "@microsoft.graph.conflictBehavior" = "rename"
}

$driveId = "xxxxxxx"
$driveItemId = "xxxxxxxx"

New-MgDriveItemChild -DriveId $driveId -DriveItemId $driveItemId -BodyParameter $params

Response:

To confirm that, I checked the same in OneDrive where new folder is created successfully as below:

Reference: Folder - Microsoft Graph v1.0