Merge pull request #134306 from razvansalajan/user/rasalaja/note_when_conn_string_is_regenerated

[ACS] Adding some notes in the Notifications concept

Author: PRMerger13

articles/communication-services/concepts/notifications.md

@@ -35,13 +35,19 @@ You can connect an Azure Notification Hub to your Communication Services resourc
 
 Communication Services uses Azure Notification Hub as a pass-through service to communicate with the various platform-specific push notification services using the [Direct Send](https://docs.microsoft.com/rest/api/notificationhubs/direct-send) API. This allows you to reuse your existing Azure Notification Hub resources and configurations to deliver low latency, reliable calling notifications to your applications.
 
+> [!NOTE]
+> Currently only calling push notifications are supported.
+
 ### Notification Hub provisioning 
 
-To deliver push notifications to client devices using Notification Hubs, [create a Notification Hub](https://docs.microsoft.com/azure/notification-hubs/create-notification-hub-portal) within the same subscription as your Communication Services resource. Azure Notification Hubs must be configured for the Platform Notifications Service you want to use. To learn how to get push notifications in your client app from Notification Hubs, see [Getting started with Notification Hubs](https://docs.microsoft.com/azure/notification-hubs/ios-sdk-get-started) and select your target client platform from the drop-down list near the top of the page.
+To deliver push notifications to client devices using Notification Hubs, [create a Notification Hub](https://docs.microsoft.com/azure/notification-hubs/create-notification-hub-portal) within the same subscription as your Communication Services resource. Azure Notification Hubs must be configured for the Platform Notifications Service you want to use. To learn how to get push notifications in your client app from Notification Hubs, see [Getting started with Notification Hubs](https://docs.microsoft.com/azure/notification-hubs/notification-hubs-android-push-notification-google-fcm-get-started) and select your target client platform from the drop-down list near the top of the page.
+
+> [!NOTE]
+> Currently the APNs and FCM platforms are supported.
 
-Once your Notification hub is configured, you can associated it to your Communication Services resource by supplying a connections string for the hub using the Azure Resource Manager Client or through the Azure portal. The connection string should contain "Send" permissions. We recommend creating another access policy with "Send" only permissions specifically for your hub. Learn more about [Notification Hubs security and access policies](https://docs.microsoft.com/azure/notification-hubs/notification-hubs-push-notification-security)
+Once your Notification hub is configured, you can associate it to your Communication Services resource by supplying a connection string for the hub using the Azure Resource Manager Client or through the Azure portal. The connection string should contain "Send" permissions. We recommend creating another access policy with "Send" only permissions specifically for your hub. Learn more about [Notification Hubs security and access policies](https://docs.microsoft.com/azure/notification-hubs/notification-hubs-push-notification-security)
 
-> NOTE: 
+> [!IMPORTANT]
 > In order to enable Apple Push Notification Service VOIP notifications, you must set the name of your notification hub to be your application bundle ID with the the `.voip` suffix. See [Use APNS VOIP through Notification Hubs](https://docs.microsoft.com/azure/notification-hubs/voip-apns).
 
 #### Using the Azure Resource Manager client to configure the Notification Hub
@@ -64,6 +70,9 @@ In the portal, navigate to your Azure Communication Services resource. Inside th
 
 :::image type="content" source="./media/notifications/acs-anh-portal-int.png" alt-text="Screenshot showing the Push Notifications settings within the Azure Portal.":::
 
+> [!NOTE]
+> If the Azure Notification Hub connection string is updated the Communication Services resource has to be updated as well.
+
 #### Device registration 
 
 Refer to the [voice calling quickstart](../quickstarts/voice-video-calling/getting-started-with-calling.md) to learn how to register your device handle with Communication Services.