How should I request the User employeeOrgData.division using the Microsoft Graph SDK?

Here’s my code…

[AuthorizeForScopes(Scopes = new[] { "User.Read.All" })]
public async Task<IActionResult> GridView()
{
    var queryOptions = new List<QueryOption>();
    queryOptions.Add(new QueryOption("$count", "true"));
    queryOptions.Add(new QueryOption("$expand", "manager($levels=1;$select=displayName)"));
    queryOptions.Add(new QueryOption("$select", "onPremisesSamAccountName,displayName,mail,jobTitle,department,surname,givenName,streetAddress,city,state,postalCode,businessPhones,mobilePhone,employeeOrgData.division"));    

    var results = await _graphServiceClient.Users
        .Request(queryOptions)
        .Header("ConsistencyLevel", "eventual")
        .Filter("employeeType eq 'Employee'")
        .GetAsync();

    //CONCATENATES THE PAGED RESULTS
    var users = new List<User>(results.CurrentPage);
    users.AddRange(results.CurrentPage.OfType<User>());

    while (results.NextPageRequest != null)
    {
        results = await results.NextPageRequest.GetAsync();
        users.AddRange(results.CurrentPage.OfType<User>());
    }

    //SORT BY LAST, FIRST
    users = users
        .DistinctBy(u => u.Id)
        .OrderBy(x => x.Surname)
        .ThenBy(x => x.GivenName).ToList();

    return View("GridView", users);
}

I’ve tried selecting both employeeOrgData and employeeOrgData.division. In both cases it’s always null.

I’ve tried expanding employeeOrgData, but it’s not exapandable.