Azure Notification Hub registrations disappear when sending a notification

Question

Recently our Azure Notification Hub became a very mysterious entity. When Apple devices register we can see them in Service Bus Explorer and as soon as we try sending any no

Answer 1

Notification hub cleans up registrations with invalid tokens during the send flow. Looks like for some reasons APNS rejects your tokens and NH just removes registrations. Make sure:

1. you are getting token from physical device (not emulator);
2. APNS certificate uploaded to NH is not expired;
3. APNS certificate uploaded to NH corresponds APNS endpoint you are using in application (sandbox or production).