FirebaseNotifications data null

hello i send from firebase a notification, and the data return null:

Message data: {}

my code(from the tut):

Code:

  Sub fm_MessageArrived (Message As RemoteMessage)
Log("Message arrived")
Log($"Message data: ${Message.GetData}"$)
Log($"Message: ${Message}"$)
Dim n As Notification
   n.Initialize
   n.Icon = "icon"
   n.SetInfo(Message.GetData.Get("title"), Message.GetData.Get("body"), Main)
   n.Notify(1)
End Sub  

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