On this challenge I have followed the link which brings me to the standard SFDC login page. I login but then get a message Houston we have a problem
You need a Developer Edition org to complete hands on challenges. You're seeing this message because you're probably trying to connect to a production org instead.
Login with Developer Edition

I clik on the link Login with Developer Edition and I get back to the main SFDC login page. My username and password are remember so I login and get and get this Houston we have a problem message.

I know my Admin and Developer account are linked as the points I have been awareded for both modules are showing in my profile.

I am going around this login - Houston I have a problem loop.

Can someone assist