android pie message notifications not working

Tap the menu icon (three vertical dots) > Show system.

Choose a ringtone from the list (e.g., Silent, Default, etc.) then tap OK, Done, or Apply. If disabled, notifications won't appear in the status bar. Enabled when a checkmark is present or switch is in the ON position. Also, Android supports multiple channels for notifications. If applicable, tap 'Notifications' or 'Notification settings'. Most phone and battery optimizing apps close all the background processes to free up RAM and put less load on the phone. Then click on the Notifications option and make sure All Messages notifications is toggled on. Stop using battery & phone optimizing apps.

Find and tap Settings > Apps & notifications > See all apps. You can check notification settings from System Settings > Apps and Notifications > Apps > Messages.

To temporarily remove the system software update notification icon By updating your device to the latest available software also reduces the risk of having to hand it in for repair to a service center. Note! It is highly recommended for you to go through with software updates as it increases the overall performance and improves the security protection of the device.

The update notification will reappear after a restart of your Xperia device, or if you search for an update manually. You can however deactivate it temporarily. In Android version 5.0 or higher, it is not possible to permanently deactivate the system software update notification. The software update notification icon is designed to appear whenever there is new system software available.

Android pie message notifications not working