Permanent Email vs. Temporary
When I try to submit my enrollment application, I get a message that says, "We are currently not accepting applications from temporary email domains. Please change your email address to a permanent email before submitting your application."
The email I'm using is my "permanent" email -- used for about 10 years. It uses the "outlook.com" domain, which is listed as one of the services to use for free email. Also, when I set up my OpenCCC account, that email address was fine.
So, what is wrong with the domain of my email address and what constitutes a "permanent" email?