Push notification not delivered for some devices

Please provide the following:

  1. SDK Version: 35
  2. Platforms(Android/iOS/web/all): iOS

Our app uses Expo push notification to deliver push messages. It works just fine for most clients, but I am trying to debug one client where he is not receiving the push messages. Here is what I am seeing:

  1. Using Expo push notification tool as well as my own client code, I can send messages to his Expo push token. Expo server responds with ok status. I checked the status given the receipt id and the status also says ok.
  2. But the client never receives the messages. I ensure that the app is not already opened on his iOS device and that notification is enabled for the app.

My question is: how do I debug this further? I understand that Apple server might decide to send or not to send messages based on various factors. How do I find out what Apple server did with the messages?

I have googled quite a bit but I couldn’t find much info on how to proceed further. I hope that someone has experienced the same, and can help with some leads.

Thanks for your help,

Huey

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