What is restricting my notifications?

[AC Question]

I've tried fidling around with the settings and downloaded some apps to expand notifications, but I can't get them to work.
The locked screen doesn't display notifications (downloaded dashclock)
I can't get the number of notifications on the app icons (downloaded teslaunread).

Is another app blocking my notifications? Cleanmaster for instance?

I have a Huawei Y6 ii compact.