What if the flash doesn't flash when the message comes from WeChat?

It should be that you didn't turn on the lock screen notification, so this will happen. Enter the new message notification interface and turn on this function.

Wechat version: 8.0.32

The specific steps of opening:

1. Open WeChat, click Me in the lower right corner, and then click Settings.

2. Then click New Message Notification.

3. Turn on the switch for receiving voice and video call invitation reminders, and then click voice and video call invitation reminders.

4. Then click the lock screen notification.

5. Finally, click Show.