iOs push notifications stop working


I send push notifications from the appery app console, suddenly I get an error for a lot of devices, I found that the issue is with all iOs devices (Android devices are working perfect). I check and all my certificates are in place in the Apple Developer Console.

I'm receiving this error:
Description: Error from APNS: The service is unavailable

Initially I thought it was temporary but not, what should be happen?.

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