FCM Push Notifications delivered from Notify & our Conversations API are only sent as Data Messages, without standard notification payload to show in notification area.

Firebase Cloud Messaging data messages

Data messages are silent notifications that do not raise an alert in the notification tray but instead wake the app up in the background and allow it to process the notification and potentially raise a local notification. Data messages are typically preferred by Android developers for two reasons:

• The aesthetics of Android default alert notifications rendered by the OS often does not match the developer's expectations
• When a user taps an alert or hybrid notification the app is not launched unless a click_action is specified

Developers should parse FCM data push to extract data they need to show:

Conversations parsePushNotification