Add more FAQs

Author: sethmanheim

articles/notification-hubs/notification-hubs-gcm-to-fcm.md

@@ -5,7 +5,7 @@ author: sethmanheim
 manager: femila
 ms.service: notification-hubs
 ms.topic: article
-ms.date: 05/02/2024
+ms.date: 05/03/2024
 ms.author: sethm
 ms.reviewer: heathertian
 ms.lastreviewed: 03/01/2024
@@ -44,6 +44,22 @@ Yes, FCM legacy and FCM v1 are treated as two separate platforms in Azure Notifi
 
 The debug send response contains a `results` property, which is an [array of registration results](/rest/api/notificationhubs/notification-hubs/debug-send?tabs=HTTP#registrationresult) for the debug send. Each registration result specifies the application platform. Additionally, we offer [per-message telemetry](/rest/api/notificationhubs/get-notification-message-telemetry) for standard tier notification hubs. This telemetry features `GcmOutcomeCounts` and `FcmV1OutcomeCounts`, which can help you verify which platform is used for send operations.
 
+### Do I need to create new registrations for FCM v1?
+
+Yes, but you can use import/export. Once you update the client SDK, it creates device tokens for FCM v1 registrations.
+
+### Google Firebase documentation says that no client-side changes are required. Do I need to make any changes in Notification Hubs to ensure my notifications are sent through FCM v1?
+
+For direct send operations, there are no Notification Hubs-specific changes that need to be made on the client device. If you store installations or registrations with Azure Notification Hubs, you must let Notification Hubs know that you want to listen to the migrated platform (FCM v1). Regardless of whether you use Notification Hubs or Firebase directly, payload changes are required. See the [documentation on how to migrate to FCM v1](notification-hubs-gcm-to-fcm.md).
+
+### My PNS feedback shows "unknown error" when sending a FCM v1 message. What should I do to fix this?
+
+Azure Notification Hubs is working on a solution that reduces the number of times "unknown error" is shown. In the meantime, standard tier customers can use the [notification feedback API](/rest/api/notificationhubs/get-pns-feedback) to examine the responses.
+
+### How can Xamarin customers migrate to FCM v1?
+
+Xamarin is currently being deprecated. Xamarin customers should migrate to MAUI, but MAUI is not currently supported by Azure Notification Hubs. It's recommended that Xamarin customers move away from Notification Hubs if they need FCM v1 sends.
+
 ## Next steps
 
 - [What is Azure Notification Hubs?](notification-hubs-push-notification-overview.md)