Summary

We need PFN -> Entra AppId/ObjectId mapping for a production Store-distributed packaged WinUI 3 / Windows App SDK app. The documented mapping process currently appears unreachable because Win_App_SDK_Push@microsoft.com rejects mail.

App type

• Production packaged WinUI 3 / Windows App SDK desktop app
• Distributed through Microsoft Store / Partner Center
• Intended for third-party customer users, not only users inside our organization
• Uses the Windows App SDK push notification flow, not legacy UWP WNS credentials

Public app identifiers

• Store product ID: 9P64ZMCCCMNR
• PFN: 27369LabVoiceInc.LabVoice_04arp211gq58w
• Package identity name: 27369LabVoiceInc.LabVoice

We can provide the Entra AppId/ObjectId privately to Microsoft staff for the mapping request, but we would rather not publish those identifiers in a public GitHub issue.

What works

• PushNotificationManager.Register() succeeds.
• CreateChannelAsync(...) succeeds.
• A WNS channel URI is returned.
• Backend token acquisition for https://wns.windows.com/.default succeeds using a dedicated multi-tenant Entra app.

Failure

Sending a push notification to the returned Windows App SDK channel URI fails with 403 Forbidden.

This looks consistent with the PFN not being mapped to the Entra AppId/ObjectId yet.

Documented mapping process is blocked

The current quickstart says packaged apps should request mapping by emailing Win_App_SDK_Push@microsoft.com with PFN, AppId, and ObjectId.

That mailbox bounces:

550 5.4.1 Recipient address rejected: Access denied

Azure route also appears gated

We registered Microsoft.WindowsPushNotificationServices on our Azure subscription. Registration succeeded, but the provider exposes only checkNameAvailability, no create/list/update operations or usable resource types.

A public research pass suggests the actual ARM type may be Microsoft.WindowsPushNotificationServices/registrations, but we found no public REST schema or usable portal/ARM creation path.

Request

Could the Windows App SDK team please clarify the current production process for PFN -> Entra AppId/ObjectId mapping?

Specifically, please either:

1. process this PFN mapping through a private channel,
2. provide the replacement mapping contact/process,
3. fix or replace the documented mailbox, or
4. document the Azure/Partner Center self-service route if one exists.

Official doc currently pointing to the bouncing mailbox:
https://learn.microsoft.com/en-us/windows/apps/develop/notifications/push-notifications/push-quickstart