I am trying to take the IoT Modeling with ThingWorx course. Under Pre-Work, it says to register for a new class at thingworxacademic.com using the access code “modeling83-2019-ptcu”. However, when I click the “Register for a New Class” button on the thingworxacademic.com site, it asks for a Class Access Code (which I entered) and a Confirm Password. The Register Class button is disabled until I enter something in the Confirm Password field. I tried entering the same code but this generates an error. What is the password?