Push messages do not work on Android

[jasons-codes]

[REQUIRED] Please fill in the following fields:

• Unity editor version: 2019.4.12f1
• Firebase Unity SDK version: 7.0.1
• Source you installed the SDK: Unity Package Manager
• Problematic Firebase Component: Cloud Messaging
• Other Firebase Components in use: Analytics, Crashlytics
• Additional SDKs you are using: Facebook, GoogleMobileAds, GoogleSignin, UnityMobileNotification, UnityIAP, etc
• Platform you are using the Unity editor on: macOS
• Platform you are targeting: Android
• Scripting Runtime: IL2CPP

[REQUIRED] Please describe the issue here:

Push messages do not work on Android.

Steps to reproduce:

https://firebase.google.com/docs/cloud-messaging/unity/client?hl=en
I added FCM to my project as described in that link.
However, while iOS works fantastically, I haven't received any push messages on Android.

The test environment is as follows.

• iOS: Testing with Xcode development certificate
• Android: Testing to build apk with local keystore (both the signature for AAB managed by Google and the signature of Keystore managed by Google are registered in Google Play)

The FCM version in use is 7.0.1.

---

Have you been able to reproduce this issue with just the Firebase Unity quickstarts (this GitHub project)?

Not tested

What's the issue repro rate? (eg 100%, 1/5 etc)

100% (It doesn't always work on Android)

What happened? How can we make the problem occur?
This could be a description, log/console output, etc.

FCM push notifications do not work on Android.
FirebaseMessaging.TokenReceived checked the log with logcat when Firebase was initialized, but FirebaseMessaging.MessageReceived has no log in logcat even though it sends multiple push messages.

If you have a downloadable sample project that reproduces the bug you're reporting, you will
likely receive a faster response on your issue.

If the problem persists, I plan to write a test sample and I will share it at that time.

[jasons-codes]

My project's Google Play Console is using a Google-managed signature, but I also added a Keystore fingerprint that I manage.

So, I registered both the signature of my keystore and the signature provided by Google with Firebase. (SHA-1 and SHA-256 are registered 2 each and a total of 4 fingerprints are registered)

And I created AAB to check if it is an issue due to app signing, but as a result of Google Play internal testing, AAB also did not receive a push message.

[DellaBitta]

Hi @jason-codes,

I think this might be a duplicate of #883 6.16.x FCM notifications not received clicking PushNotification on Android. Could you check it to confirm? Thanks!

[DellaBitta]

Also note #877 to which #883 refers.

[jasons-codes]

Hi @DellaBitta,

In my case, either the foreground or the background, the push message doesn't appear on Android. Even FirebaseMessaging.MessageReceived is unresponsive.

I ran a local notification with Unity Mobile Notification to see if my app couldn't print notifications on Android.
And local notifications worked fine.

https://github.com/firebase/quickstart-unity/tree/master/messaging/testapp
Next, I downloaded the sample here and installed FCM 7.0.2 as the package manager.
I set many options (App ID, IL2CPP, keystore of my app, etc.) the same as my project and tested Android, FCM works fine with this sample!

What is the difference?
As much as possible, I tried to modify my project again to be the same as that implemented in the sample, but FCM does not work in the Android build of my project.

I plan to install and test the Facebook SDK, Google Sign-in, Google Mobile Ads, gRPC, and many other plugins that are being used in my project in the sample project next day to see if the third-party library is the problem.
But it's too hard to find a problem this way.
Are there any other hints?

[jasons-codes]

I figured out what was causing the problem.

The previous Firebase 6.x.x version creates the Assets/Plugins/Android/Firebase folder, and the current Firebase 7.0.x version creates FirebaseApp.androidlib instead of that folder.

When upgrading Firebase, the old folder was not deleted, and if I delete it manually, Android push message works fine.

Thanks you.

[DellaBitta]

Hi @jasons-codes,

Great, I'm glad to hear the news and thanks for circling back to us with the information. I'm going to close this issue for now. Thanks again!