The phone isn’t muted,
but you still keep missing new messages.
How to fix this problem?
Try these scenarios-based solutions.
No vibration or ringtone when a new message comes in
Please check whether you are using an incompatible third-party theme. If you have applied such theme, please go to Themes 
>Me>PRESET THEMES, select a theme, and touch APPLY.
Click the arrow to check the next step
Check whether you receive new messages during a chat on a chat App. If so, please exit the current chat App and check whether there is a vibration or ringtone when a new message comes in.
*Reminder: If this issue is app-specific, please contact the app developer for help.
The screen does not turn on for new messages while the screen is off
Enable Wake screen
Open Settings 
, search for and access Wake screen under NOTIFICATIONS, and enable Wake screen.
Click the arrow to check the next step
No banner notification appears when a new message comes in
Open Settings > Apps > Apps, locate Messaging, touch Notifications > Do Not Disturb notifications and enable Banners.
Click the arrow to check the next step
*Reminder: Banner notification is not available on some apps. Please refer to the actual situation.
Notifications are not displayed on the lock screen
First try step 2 to enable Wake screen. If the problem persists, please try the following methods:
Check whether Face Unlock has been enabled
To protect users’ privacy, the message content will not be displayed on the lock screen when Face Recognition is enabled.
If you do not want to hide the content, go to Settings > Security & privacy > Face Recognition, enter the password, and disable Smart lock screen notifications; or disable Smart Unlock on the interface of Biometrics & password.
Click the arrow to check the next step
*Reminder: Smart lock screen notifications is not available on EMUI 10.1/10.1.1 & Magic UI 3.1/3.1.1. Please refer to the actual situation; When Smart Unlock feature is disabled, this feature will not be available on wearables.
Check whether App Lock has been enabled
Go to Settings > Security > App Lock. Disable App Lock for the App.
Click the arrow to check the next step
*Reminder: This feature is only available on EMUI 9.0.1 and Magic UI 2.0.1 or later.
If the issue persists, please back up your data and take your phone to the nearby Authorised Service Center for diagnosis with the proof of purchase. Professional Huawei technicians will try their best to solve your problems.
Have no idea about how to find Authorised Service Center? Open Support App 
, tap Service centers under QUICK SERVICES, then select your city or enter your address to find nearby service centers in a few taps.
Click the arrow to check the next step
If going to Service Centre is not an option for you, please do not hesitate to contact hotline or live chat for further assistance.
*Reminder: The instructions above are followed with EMUI 10.1 as an example. It may be slightly different in other versions. Please adjust according to your actual situation.