Cannot get MailboxSettings from Microsoft Graph with .Net SDK

Question

I'm trying to get User Mailbox Settings from Microsoft Graph v1.0 with the Ms Graph .Net SDK and with application permissions.

I have the correct permissions (MailboxSettings.Read and User.Read.All) and they are admin consented.

Here is the code for the call:

    var settings = await graphClient.Users[{userId}].Request()
        .Select(e => new
        {
            e.MailboxSettings
        })
        .GetAsync();

When I make the call I get the error:

ErrorAccessDenied, Access is denied. Check credentials and try again.

There is (probably) nothing wrong with my graphClient object as I can successfully call other resources, for instance:

var events = await graphClient.Users[{userId}].Events.Request()

I have tried to make a HTTP request to the API and then I get a successful response. (I'm using the same clientId, clientSecret etc. when I create the graphClient and when I fetch the auth token for the API call).

This is the endpoint I'm calling:

https://graph.microsoft.com/v1.0/users/{userId}/mailboxSettings

Why do I get an error when I use the SDK? Is my request incorrect or is there a bug in the SDK?

Answer 1

Got it. It's a bug: https://github.com/microsoftgraph/msgraph-sdk-dotnet/issues/538. You need both read and write persmissions in order to read MailboxSettings.

Answer 2

You can use this with only mailboxsettings.read.

async Task GetMailboxSettings(GraphServiceClient client)
{
    var mailboxSettingsUrl = client.Users["[email protected]"].RequestUrl + "/mailboxsettings";
    HttpRequestMessage hrm = new HttpRequestMessage(HttpMethod.Get, mailboxSettingsUrl);

    await client.AuthenticationProvider.AuthenticateRequestAsync(hrm);

    HttpResponseMessage response = await client.HttpProvider.SendAsync(hrm);

    if (response.IsSuccessStatusCode)
    {
        // Deserialize into OneNotePage object.
        var content = await response.Content.ReadAsStringAsync();
        MailboxSettings mailboxSettings = client.HttpProvider.Serializer.DeserializeObject<MailboxSettings>(content);
    }
}