Hello. I also have the same issue even if I've selected the option of showing notification when the screen is locked or even on the home screen. So what I usually do to see the notification without opening the app for example a whatsapp message. (1) Unlock the screen (2) Slide the notification panel down (3) Press back button (4) Slide the notification panel down again and the notification will be there. Hope it helps in a way but if it doesn't you can go to your Hicare app and select live chat and chat to someone working at Huawei. They are always willing to help and very friendly.
Hello Give this a try. The best thing that you can do right now is to check if the problem is caused by a system glitch. You will need to perform a factory reset on the phone from the recovery mode. Take note that this action will erase your phone data. *Hold down the Power key to switch off the device. *Press and hold Volume Up and Power key. *Release the keys as soon as the Huawei logo appears on the screen. *You should be in a Recovery Mode menu. *Navigate here by using Volume buttons and select options by using the Power key. In case the problem still occurs after the reset then this could already be a hardware related problem in which case you will need to bring the phone to a service center and have it checked