Why iOS APNS VOIP development(sandbox) push notification is not working?

$ apn push "<device_token>" -c /path/APPLE_VOIP_SERVICE.pem
-m "Houston! we have a problem!"

Apple is ‘rejecting’ those voip push notification requests without apns-push-type header set to “voip” in sandbox, but not in production ‘yet’.

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https://www.linkedin.com/in/stephen-chen-tsung-yi

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