Hi why I get always empty message from server?

public void OnMessageReceived(object sender, Firebase.Messaging.MessageReceivedEventArgs e) {
DebugLog("Received a new message"); <--- this work
var notification = e.Message.Notification;
if (notification != null) {
DebugLog("title: " notification.Title); <--- this doesn't work
DebugLog("body: " notification.Body);
}
if (e.Message.From.Length > 0)
DebugLog("from: " e.Message.From); <--- this doesn't work
if (e.Message.Data.Count > 0) {
DebugLog("data:"); <--- this doesn't work
foreach (System.Collections.Generic.KeyValuePair<string, string> iter in
e.Message.Data) {
DebugLog(" " iter.Key ": " iter.Value);
}
}
}