How do I enable notifications for a specific Metro App

[chapmattman]

My MAIL app from MS stopped working. Calendar and others continued to work. I uninstalled them (you cannot uninstall or reinstall mail seperate from Calendar and messaging) and reinstalled it from the store and now they are working, but notifications for mail have stopped.

I look in PC settings and under NOTIFICATIONS it says

"Show Notifications from these Apps"

MAIL is not listed under there. How do I get it there?