How to update mailbox settings with .NET Graph SDK

workaround.cs

var userId = "some-id";

var mailboxSettings = new MailboxSettings 
{
    AutomaticRepliesSetting = new AutomaticRepliesSetting 
    {
        Status = AutomaticRepliesStatus.AlwaysEnabled,
        InternalReplyMessage = "Hi",
        ExternalReplyMessage = "Bye"
    }
};

try
{
    // Get the request URL to the user from the SDK
    // and add the /mailboxsettings segment
    var requestUrl = $"{appOnlyClient.Users[userId].Request().RequestUrl}/mailboxsettings";

    // Use the SDK's serializer to generate the JSON payload
    var jsonPayload = appOnlyClient.HttpProvider.Serializer
        .SerializeAsJsonContent(mailboxSettings);

    // Create a new Http request message with the JSON payload
    var requestMessage = new HttpRequestMessage(HttpMethod.Patch, requestUrl);
    requestMessage.Content = jsonPayload;

    // Authenticate the message
    await appOnlyClient.AuthenticationProvider.AuthenticateRequestAsync(requestMessage);

    // Send the request
    var response = await appOnlyClient.HttpProvider.SendAsync(requestMessage);

    if (response.IsSuccessStatusCode)
    {
        Console.WriteLine("Updated mailbox settings");
        // If needed, deserialize the response body
        var responseBody = await response.Content.ReadAsStringAsync();
        var responseObject = appOnlyClient.HttpProvider.Serializer
            .DeserializeObject<MailboxSettings>(responseBody);
    }
    else
    {
        throw new ServiceException(
            new Error 
            {
                Code = response.StatusCode.ToString(),
                Message = await response.Content.ReadAsStringAsync()
            }
        );
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
}