FCM notifications not working in release app

Question

I am trying to send FCM notifications (between users on sending messages, friend requests etc.) in release app which is not receiving but they are sending/receiving very well in debug apk, i have searched about this and found some solutions which are not working for me

like this, I placed it in pro-guard rules but not working

 -keep class com.google.firebase.* {*;}

In my AndroidManifest.xml

        <service
            android:name=".notifications.MyFirebaseMessaging"
            android:enabled="true"
            android:exported="false">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <service
            android:name=".notifications.MyFirebaseInstanceId"
            android:enabled="true"
            android:exported="false">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>

and other dependencies, I am not including them here as the app is work fine in debug mode

Edited

I already have

1. Generated Release SHA-1 and SHA-256 keys
2. Add them in firebase console
3. Also added Google console app-signing SHA-1 and SHA-256 keys in firebase
4. Then download the Google-services.json file and add it in app module

Answer 1

You have not added your SHA-1 key for the release to your firebase console and hence not existing in your google-services.json.

1. Generate your SHA-1 for release
2. Add your release SHA-1 to firebase console
3. Download and use new google-services.json.

If you're using Google play app-signing. Make sure the key being used by play store to sign your releases is also added in step 2