$corvovaPushV5 registering but not firing onNotification

ionic-v1
1

I am trying to implement push notifications in Ionic V1 using $cordovaPushV5 but I am not able to get to work. I am able to get the device registration ID but when I test notifications using Firebase Cloud Messaging, it doesnt work. Below is app.js code -

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FCM screenshot -

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I followed the below link to implement -
http://ngcordova.com/docs/plugins/pushNotificationsV5/

What am I missing ?