The mute key is turned on.
Check whether the mute button on the left side of the phone is turned on. If there is, turn it off.
The little white dot is in mute mode.
Check the setting of the small white dot on the home screen to make sure it is in normal mode, not silent mode.
Do not disturb mode on.
If your mobile phone is in "Do Not Disturb" mode, remember to turn it off.
Wechat message notification is not open.
Don't forget to check whether message notification on WeChat is turned on, and make sure that "Allow notification" and "Sound" are turned on in Settings-Notification-WeChat.
Low battery mode on
If the mobile phone turns on the low battery mode, in order to save electricity, not only WeChat, but also other applications will not have message reminders. Check the battery icon in the upper right corner of the screen. If it is yellow, turn off the low battery mode.
Mobile phone restart
If the above methods can't solve the problem, you can try to shut down and restart, and then open WeChat again to check.
Restore factory settings
If the problem still exists, you can consider restoring the factory settings of your mobile phone, but please rest assured that this will not delete your data and files.