1. Please go to QQ-Settings-Message Notification-Notify whether the displayed message content is on.
2. Open QQ Settings-Auxiliary Functions-The system notification bar displays the QQ icon to open;
3, mobile phone settings-security and privacy/security services-notification center, see if QQ is set to not be displayed in the status bar;
4. Mobile phone settings-application/program management-display notification to see if the display notification has been cancelled.
Try the above operation ~
If you have any other questions, you can enter the OPPO enterprise platform to ask the customer service!