Looking in runtime.log we see occasional warnings for failed push notifications.
Is there a definitive list of error codes and their meaning?
message: "IOS Push Notification message failed" errorMsg: "Failed to deliver notification with error code -2" errorName: "UNKNOWN"
This error is returned from Apple and we log it in the script log. Other than that we don't know much about it. I've been trying to dig up some more information on it for another customer. I've raised it with Apple but haven't heard anything back as of yet. How many of these errors have you received ?
just a couple, it appears.