In the Google section for the topic ios device token expirationyou will find many notifications about Apple Feedback Service. It is for questioning device token expiration, therefore, when he Feedback Servicesaid that a particular one has device tokenexpired, it means that there is no way to deliver push-notificationto it device token. We should mark them as expired.
Now I could not find a mention Feedback Servicein the actual documents Apple. Is this service outdated? If so, why PushSharp , pushd libraries still use it? And if so, what to do next? Read the sending status on both platforms Googleand Microsoft?
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