ALL PHONES - No Notifications

Give the necessary permissions to the application in the phone settings.

Reminders are often blocked by the system itself. 

You can do it! If not – it`s possible to find a video instruction on YouTube for solving each problem.

https://mobilecreatures818874454.wordpress.com/my-android-device-model-is/

Select your device manufacturer and check if you find your Android version.
If it is not listed please use the latest Android version available and check if you have the same or similar settings.