This has happened for a very long time for me, but just recently it mattered. I have all options selected for notifications, but I don't get any notifications at all. I have checked the phone settings and verified that background data is allowed, no apps are closing the game in the background to save data or power, and pretty much any other setting I can think of allows notifications from the game. Battery Saver is off within the game too.
Has anyone else had this issue and solved it, or is it a coding bug?