Broken Notification Fix
We were contacted by a plenty of users to fix broken notification problem for Xiaomi and Huawei.
After long research and analysis we are introducing to you 5 steps how to fix the problem. Please not that not all 5 steps are necessary for some models.
Steps for Notification to work on Xiaomi and Huawei:
Go to settings → manage apps battery usage → choose apps. From there, pick all the apps you want to receive push notifications and select "No restrictions."
Go to settings → permissions → Autostart. From there, pick the apps you want to receive notifications, and toggle the switch to turn it on.
Go to settings → app notifications → pick the apps you want to receive notifications, then turn the toggle for "Priority" on.
Lock the app in the "recent apps"/ "app overview" plane. Do so by first opening the apps, then press the "recent apps/overview button" (thats the square button on stock Android, or the button with three horizontal lines on the Mi Mix). From there, find the app you want to receive notifications, pull down on it to "lock it", so it never gets cleared.
This last step requires Developer Options privileges. To enable that, go to settings (man... Im getting tired of typing "go to settings" ...) → about phone → tap on MIUI version tab like eight times. You should then get a little message saying "you are now a developer." Then head back out to settings, go to developer option, scroll to nearly the bottom, find "memory optimization," and turn it off. There is a possibility that 5th step can DRAIN BATTERY.