Silent Push Notification (DidReceiveRemoteNotification method not getting called ) Xamarin.Ios

Question

I follow this steps to configure ios for notifications: https://docs.microsoft.com/en-us/xamarin/xamarin-forms/data-cloud/azure-services/azure-notification-hub

This is the aps that I sent to the client (from azure Notifications payload):

{
    "aps" : {"content-available" : 1},
    "acme2" : [ "bang",  "whiz" ]
}

OR


{
    "aps" : {"content-available" : 1}
}

When My app is on Background Mode and i send one silent push, code is not triggered (neither DidReceiveRemoteNotification method nor ReceivedRemoteNotification method). Nothing happens ...

I already enabled Background Modes and Remote Notifications.

Minimum system version: 10.0 Device: IPhone Xs sfw Version 13.7

When I send a normal Push Notifications it works perfectly. The notification appears on screen and after click it the DidReceiveRemoteNotification method runs.

This doc is very good : https://medium.com/fenrir-inc/handling-ios-push-notifications-the-not-so-apparent-side-420891ddf10b

Any ideas to solve this issue?

Thank you :)