Exchange 2016 OWA Fails to Login

And how to fix it

The Problem

I had to set up a forms based authentication Exchange 2016 server for OWA so that hourly workers at my company could log into at a kiosk.

Unfortunately after they logged in, they were greeted with this error message:

“Something went wrong. We can’t get that information right now. Please try again later. X-FEServer MyServer”