Notification delivery depends on device settings. Please check for the following:
If you have any battery optimizer such as Greenify, Clean Master etc installed please whitelist MCB App in them
Please check the phone for MDM (mobile device management) software installed by your company, you would need to get MCB App in allowed apps.
Some phones may kill notifications if you force kill the app (reference), so request you to not do that. Please exit by pressing the back button.
If your mobile has an autostart functionality, please make sure that MCB App is switched on for autostart
For devices running Android version 6.0.1, check that your battery optimization is not preventing MCB App from sending you notifications. Go to Settings>Battery>Overflow menu>Battery Optimization and turn off the option for MCB App.
Different phone models have issues with notifications due to their internal settings. We have listed remedial steps some of the popular phones:
There is a helpful list by slack, please check it out: Android Notification Issues.
If your phone model is not listed here please send us a mail at firstname.lastname@example.org with the make and operating system of your phone.
Check that you are on the latest version of the MCB App. Also, do a log out from the app and log in again. If you are on the latest version it could be due to phone related issue. We also recommend that you whitelist the MCB App by going to Settings > Battery > Battery Optimisation.