Developers Guide

Troubleshoot: “Mismatch SenderID” error

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If your Android app fails to receive push notifications and you see Mismatch SenderID error while sending the notification, follow this checklist in order.

1. Make sure google-services.json is in the app module

Place the file at:

<project-root>/app/google-services.json (not in the root project or another module).

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Tip: If you use product flavors or multiple app modules, ensure each application module that builds an APK/AAB has its own correct google-services.json.

2. Verify the Sender ID = Project number

Open Firebase Console → Project settings → General and check Project number.

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It must match the project_number in your google-services.json.

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3. Confirm the same Firebase project is configured in NotifyVisitors

  • In the NotifyVisitors panel go to Settings → App Push → Android tab.
  • Check the Sender ID shown here.
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It must equal the Project number from Firebase and the project_number in google-services.json.

If you manage multiple Firebase projects, make sure you didn’t mix files (e.g., dev vs prod).

4. Re-upload the correct auth file

If anything looks off, re-download from Firebase and re-upload to NotifyVisitors:

  1. In Firebase Console, download the service account JSON/auth file required by NotifyVisitors (per their dashboard instructions).
  2. Upload it again in the NotifyVisitors dashboard (Settings → App Push → Android tab).
  3. Rebuild your app.

This ensures your server credentials and your app’s Sender ID come from the same Firebase project.

5. Verify at runtime (SDK v5.5.4+; debug only)

Open Android Logcat and look for:

Firebase Project ID: <firebase_project_name>
  • If this printed project name matches your app’s Firebase project, your generated token aligns with the correct project.
  • If it differs, you’re building with the wrong google-services.json (or wrong build variant).

6. Full setup guide

Cross-check every step in the NotifyVisitors doc.

Summary

  • Sender ID = Firebase Project number
  • It must match in three places: google-services.json, Firebase, and NotifyVisitors panel.
  • Re-download/re-upload auth keys from the same Firebase project and confirm Logcat shows the correct project at runtime.

Updated 1 day ago