pushNotification 500 error response for IOS

Question

Hello, I am using fire base push notification for Android and IOS, Android it is working fine when it is local, but when i am publishing this code to aws, then it is throwing error 500, after publishing, Android is working but i have problem with IOS,

 

Local developing senario push notification working properly,but after deploying IIS Server not working push notification for IOS.(Android push notification working fine)