Upload an image to windows azure with xamarin.forms - xamarin.forms

Question

I am trying to make a simple xamarin.forms app for picking an image from the phone gallery and uploading i to the azure storage service.
This is what I have done, but unfortunately I got the error message
"{Microsoft.WindowsAzure.Storage.StorageException: Server failed to authenticate the request."
The pick image from galley code:
private MediaFile mediaFile;
public ImageUpload ()
{
InitializeComponent ();
}
private async void Button_Clicked(object sender, EventArgs e)
{
await CrossMedia.Current.Initialize();
if(CrossMedia.Current.IsPickPhotoSupported==false)
{
await DisplayAlert("No Pick", "No Available", "ok");
return;
}
this.mediaFile = await CrossMedia.Current.PickPhotoAsync();
if (this.mediaFile == null)
return;
//Show The path in the Xaml
LocalImagPath.Text = this.mediaFile.Path;
//Show the image in the Xaml
MyImageFile.Source = ImageSource.FromStream(this.mediaFile.GetStream);
}//end btnClikcked
private async void uploadPhoto_Clicked(object sender, EventArgs e)
{
try
{
var imageName = await ImageManager.UploadImage(this.mediaFile);
}
catch(Exception ex)
{
ex.StackTrace.ToString();
}
}//end uploadPhoto_Clicked
This is the ImageManger Class:
class ImageManager
{
private static Random random = new Random();
// Uploads a new image to a blob container.
public static async Task<string> UploadImage(MediaFile image)
{
CloudBlobContainer container = GetContainer();
// Creates the container if it does not exist
//await container.CreateIfNotExistsAsync();
// Uses a random name for the new images
var name = Guid.NewGuid().ToString();
// Uploads the image the blob storage
CloudBlockBlob imageBlob = container.GetBlockBlobReference(name);
imageBlob.Properties.ContentType = "image/jpeg";
await imageBlob.UploadFromFileAsync(image.Path);
return name;
}
// Gets a reference to the container for storing the images
private static CloudBlobContainer GetContainer()
{
// Parses the connection string for the WindowS Azure Storage Account
CloudStorageAccount account = CloudStorageAccount.Parse(Configuration.StorageConnectionString);
CloudBlobClient client = account.CreateCloudBlobClient();
// Gets a reference to the images container
CloudBlobContainer container = client.GetContainerReference("bepartphoto");
//Set The Permissions
BlobContainerPermissions blopPerm = new BlobContainerPermissions();
blopPerm.PublicAccess = BlobContainerPublicAccessType.Container;
container.SetPermissionsAsync(blopPerm);
return container;
}//end GetContainer
}//end class