If the Oppo smartphone's screen is turned off, it will not be turned on by default when new notifications are sent, and ColorOS offers an option in the settings to turn the screen on when new notifications are sent.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Notifications & status bar
Step 3:  Enable or Disable  Wake screen when a notification is received
  1. Open the Settings
  2. Tap on Notifications & status bar
  3. Enable or Disable Wake screen when a notification is received

Oppo Instructions
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