MismatchsenderId: How can I send push notifications?

We have seen that this issue might occur(but not always), if you have migrated your Google project to Firebase, and you are using a Legacy key in MoEngage Dashboard. In this article, we will help you with getting the right server key for sending push notifications.


  • Visit the Firebase Console.
  • Select the project name that you are using to send push notifications.
  • Click on Project settings, there is a settings icon, right to the overview. You will find it there.
  • Under Project Settings, select Cloud Messaging. You will see 2 keys mentioned in there. Screen_Shot_2017-05-21_at_12.01.43_pm.png
  • The legacy server key is what you have used on MoEngage Dashboard and you are not able to send notifications. 
  • Copy the Server key,  which is a longer one, and
  • Navigate to MoEngage App > Settings > Channel > Push and update the GCM API server key.
  • After you update the Server key and create a campaign on the dashboard, you should receive push notifications on your desktop/mobile.
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