Background push notification is not receiving in Android Q-Municate

[roma50]

I am modifying qmunicate app provided by quickblox and according to quickblox documentation they have added firebase notification service for notifications and they have asked to add Google API key in quickblox admin panel and Google project key in project and I have done both things and after that I have checked new users are getting subscribed to firebase notifications but still I am not receiving notifications. Please help me how to solve this issue. Thanks