microsoft graph – List Permissions for Sharepoint Sites Using GraphAPI

I’m trying to retrieve site permissions for SharePoint sites using GraphAPI. I’ve got the API working and can list sites, subsites, lists, drives, etc. However, when I run /sites/{siteID}/permissions I get the following response:

{
    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#sites('root')/permissions",
    "value": ()
}

It’s not showing any of the default or custom site permissions. Is there any way to do this?