Объект BackgroundUploadAsync Error не установлен в экземпляр

Я попытался загрузить файл в OneDrive. Я успешно подключаюсь и аутентифицируюсь в OneDrive, но при попытке загрузки получаю сообщение об ошибке: Object reference not set to an instance of an object.

Код:

IsolatedStorageFile iso = IsolatedStorageFile.GetUserStoreForApplication();
// Release all resources from DB 
App.AppViewModel.DisposeCurrentDB();

IsolatedStorageFileStream toUploadStream = iso.OpenFile(AppResources.DatabaseName + ".sdf", FileMode.Open);

LiveConnectClient liveClient = new LiveConnectClient(oneDriveAuthClient.Session);

try
{
    LiveOperationResult uploadResult = await liveClient.BackgroundUploadAsync(
        oneDriveFolderId, 
        DatabaseBackupname, 
        toUploadStream.AsInputStream(),
        OverwriteOption.Overwrite);

    dynamic result = uploadResult.Result;
    MessageBox.Show("Upload successful. Uploaded to " + result.source);
}
catch (LiveConnectException ex)
{
    MessageBox.Show("Error uploading backup: " + ex.Message);
}

App.AppViewModel.RefreshCurrentDB();

Метод BackgroundUploadAysnc выдает исключение. oneDriveFolderId установлен и существует в OneDrive. DatabaseBackupname — это правильное новое имя файла, которого нет в OneDrive. Я проверил поток в отладчике, и этот объект не был пустым и имел размер.

Stacktrace
   at Microsoft.Live.Operations.TailoredUploadOperation.<OnGetUploadLinkCompleted>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__4(Object state)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()

Я изменил код загрузки на это:

LiveUploadOperation operation = await liveClient.CreateBackgroundUploadAsync(
    oneDriveFolderId, 
    DatabaseBackupname, 
    toUploadStream, 
    OverwriteOption.DoNotOverwrite);
await operation.StartAsync();

и метод CreateBackgroundUploadAsync выдает следующее исключение:

Message = "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"
   at Windows.Networking.BackgroundTransfer.BackgroundUploader.CreateUploadFromStreamAsync(Uri uri, IInputStream sourceStream)
   at Microsoft.Live.Operations.CreateBackgroundUploadOperation.<OnGetUploadLinkCompleted>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__4(Object state)
   at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()