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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).

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  App management
Step 3: Tap on  App list
Step 4: Choose an  App
Step 5: Tap on  Data usage details
Step 6: Enable or disable  Background data
  1. Tap on Settings
  2. Tap on App management
  3. Tap on App list
  4. Choose an App
  5. Tap on Data usage details
  6. Enable or disable Background data
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Oppo Instructions