How to prepare APN for production

Im trying to deploy my app with notifications but it's giving me the biggest headache in the world. All other questions ive seen with regards to this seem outdated.

I set up APNs to be sent from a nodeJS script that I have running. When running in my sandbox everything was working well. As soon as I sent my app to TestFlight, notifications stopped sending. My script is still Successfully sending to the Notification Id registered with my phone but im assuming its not the correct production Id. If anyone canhelp get me sending production notifications it would be greatly appreciated! Thank you

APN Server code

 var options = {
token: {
key: "AuthKey_6V27D43P5R.p8",
keyId: "3Z6SEF7GE5",
teamId: "ASQJ3L7765"
},
    production: true
};
var apnProvider = new apn.Provider(options);
function SendIOSNotification(token, message, sound, payload, badge){
var deviceToken = token; //phone notification id
var notification = new apn.Notification(); //prepare notif
notification.topic = 'com.GL.Greek-Life'; // Specify your iOS app's Bundle ID (accessible within the project editor)
notification.expiry = Math.floor(Date.now() / 1000) + 3600; // Set expiration to 1 hour from now (in case device is offline)
notification.badge = badge; //selected badge
notification.sound = sound; //sound is configurable
notification.alert = message; //supports emoticon codes
notification.payload = {id: payload}; // Send any extra payload data with the notification which will be accessible to your app in didReceiveRemoteNotification
    apnProvider.send(notification, deviceToken).then(function(result) {  //send actual notifcation
    // Check the result for any failed devices
    var subToken = token.substring(0, 6);
    console.log("Succesfully sent message to ", subToken);
    }).catch( function (error) {
            console.log("Faled to send message to ", subToken);
    })
}