i have the same problem too!!
I’ve just started Chapter 3 while waiting it fix.
To not duplicate, leaving link on other topic with my observations for this issue…
Try working with Microsoft Edge. It works fine. It’s not working on Chrome. Maybe it’s due to browser issues.
after clearing the cookies, the IDE worked for me!
We are glad that your problem is resolved. And, we wish you Happy learning with the rest of the course!
In case you have any doubts, please feel free to reach out to us.
Curriculum Services Engineer