Tried the above suggested steps and even logged into my account on a completely different laptop and still the same error message.
Can you please take a look at the following page from the Codecademy Help Centre:
As well as some troubleshooting steps, that page contains a list of the domains which the Learning Environment (LE) needs to be able to access to deliver the lessons and projects.
You should check that there are no issues accessing these domains, which you can do by opening your browser’s dev tools (F12, usually) and checking the Network tab for any requests which are returning an HTTP error code (e.g. 403, 404, 500…). If you’re getting an error code from any of the domains listed on that Help Center page, please let us know.
While re-working through Python 3’s Loops section, I found that I was unable to connect to Codecademy and therefore unable to edit the code editor. This is specifically for page 9/11, List Comprehensions. If I select Back, I am able to connect to the code editor in previous pages, as well as make edits and complete the page’s instructions. However, I am not able to complete page 9 and cannot advance to pages 10 and 11.
I have cleared all of my cookies, historical data, etc. in Chrome, closed and restarted Chrome, logged in and logged out, tried accessing through incognito mode, and tried accessing via Firefox. None of these attempts has enabled me to access the server to complete page 9.
Please look at my previous post in this thread and make sure that none of the domains listed on that page are being blocked, and that there are no HTTP error codes being returned when you’re in the Learning Environment.