onMessageReceived() can't receive Notification in background when app is closed

[dhruvika123]

Hello,
I'm not able to receive any notification in background as system notification in Android and IOS

Ionic CLI : 5.4.4
Cordova CLI : 9.0.0 (cordova-lib@9.0.1)
Cordova Platforms : android 8.1.0
@angular/cli : 8.1.3

Dependencies in package.json for Firebase X plugins:
"dependencies": {
"@ionic-native/firebase-x": "^5.26.0",
"cordova-plugin-firebasex": "^9.1.2-cli",
}

Code of FCM service for notification.

async listenToNotifications() {

return this.firebaseNative.onMessageReceived().subscribe(
 async res => {
    this.translate.get("OK").subscribe(value => {
      this.ok_label = value;
    });
    this.translate.get("CANCEL").subscribe(value => {
      this.cancel_label = value;
    });
    let msg: any = res;
    if (this.platform.is("android")) {
      if (msg.type == "publish_ig") {
        msg.body = msg.postText;
        let alert = await this.alertCtrl.create({
          header: msg.title,
          message: msg.titleText,
          buttons: [
            {
              text: this.cancel_label,
              role: "cancel"
            },
            {
              text: this.ok_label,
              handler: async () => {
                let modal =await this.modalCtrl.create({
                  component:ShareInstagramPage,
                  componentProps:	msg
                });
                modal.present();
              }
            }
          ]
        });
        alert.present();
      }
    } else {

      if (
        msg["gcm.notification.type"] == "publish_ig" &&
        msg.tap
      ) {
        let data = {
          type: msg["gcm.notification.type"],
          titleText: msg["gcm.notification.titleText"],
          origin: msg["gcm.notification.origin"],
          blogId: msg["gcm.notification.blogId"],
          body: msg["gcm.notification.notificationText"],
          igPic: msg["gcm.notification.igPic"],
          screenName: msg["gcm.notification.screenName"],
          media0: msg["gcm.notification.media0"],
          media1: msg["gcm.notification.media1"],
          media2: msg["gcm.notification.media2"],
          media3: msg["gcm.notification.media3"]
        };
        
        let modal =await this.modalCtrl.create({
          component:ShareInstagramPage,
          componentProps:	msg
        });
        modal.present();
      }
    }
  })

}

And this method listenToNotifications() is calling in app.component.ts when platform is ready.

Currently when i am sending notification via backend I'm receiving notification alert but only when app is open.

Really appreciate if anyone can help.
Thanks

[dpa99c]

Background notifications are working fine for myself and other users of this plugin, indicating the issue is not caused by a bug in the plugin code.

Please use the example project as a known working codebase to validate your Firebase configuration.

Please also search for existing closed issues which may help you eg #425