Why is there no new message notification on WeChat as long as the screen is black after upgrading the HarmonyOS system?

Hello, in this case, we suggest the following actions:

1. Enter mobile phone housekeeper-power saving management-settings-turn on the switches of "Keep WLAN connection while sleeping" and "Connect data service" in dormant networking;

2. In the power saving management-protected application, turn on the switch behind WeChat and add it to the protected application.

3. In Settings-Developer Options, turn off the "Don't Keep Active" switch under the application, and set the background process limit to a value other than "Don't allow background processes".

4. In the traffic management-application networking, open the mobile data and WLAN items behind WeChat.