We are currently implementing the Notifications API for Apps & Books and are seeing frequent (90%+) failures when handling these requests.
We're using ASP.NET Core 6 and are seeing System.OperationCanceledException implying that the Apple servers are cancelling the request while our service is processing it.
There is no documentation to indicate that the API has a specific timeout and we can't see anything at fault with our code, nor can we reproduce it with test requests. Has anyone else seen similar cancellation / timeout issues with the Notification API?