Add exchange calendar to calendar app

I am trying to figure out how to add a exchange calendar to any calendar app. I've tried using the default app, Google calendar, and cal, but I don't see anywhere to add an exchange calendar. In play store both Google calendar and cal advertise they are capable of exchange.

Even in the phone "settings", under accounts -> add account, no luck

I'm using cloud magic for my exchange email and it works great.
Didn't know it's so difficult on Android.