FCM getting MismatchSenderId

Question

I have an application that uses Google FCM for sending push notifications.

When i send a push notification to a group of users, i get a response of MismatchSen

Answer 1

I had the same issue in my react-native - node.js project. I wanted to send notifications in android. Everything was set-up and working fine (i.e. I was able to send notifications from node.js and receive notifications on android device).

After a few days, I had to use a different firebase account, so I changed the google-services.json file in my project's android/app folder and rebuilt the project. But, when I tried sending notification from my server once again, I got an error -

{.............
  errorInfo: {
    code: 'messaging/mismatched-credential',
    message: 'SenderId mismatch'
  },
  codePrefix: 'messaging'
}

Solution:

the XML file at the location - app/build/generated/res/google-services/{build_type}/values/values.xml was not getting automatically updated according to new google-services.json. It still consisted of old values from my previous google-services.json file. I had to change values.xml file manually.

This is how app/build/generated/res/google-services/{build_type}/values/values.xml file look (You need to change it manually if it does not get updated automatically according to google-services.json)-

    
    1:1035469437089:android:73a4fb8297b2cd4f

    
    1035469437089
    337894902146-e4uksm38sne0bqrj6uvkbo4oiu4hvigl.apps.googleusercontent.com
    UA-65557217-3
    https://example-url.firebaseio.com
    AIzbSyCILMsOuUKwN3qhtxrPq7FFemDJUAXTyZ8
    AIzbSyCILMsOuUKwN3qhtxrPq7FFemDJUAXTyZ8
    mydemoapp

 

You can refer to these links:

1. https://firebase.google.com/docs/projects/multiprojects
2. Processing the JSON file: https://developers.google.com/android/guides/google-services-plugin#processing_the_json_file.