In order to receive notifications from apps that are not currently actively used on Oppo smartphones, the background data of the respective app must be activated, which it is by default, allowing the app to access the Internet in the background.
If background data is deactivated, no data can be accessed via the Internet and therefore no notifications will appear (does not apply to offline notifications).
- Tap on Settings
- Tap on App management
- Tap on App list
- Choose an App
- Tap on Data usage details
- Enable or disable Background data