I am unable to complete the challenges in courses as site is failed to fetch the sandbox details in all the challenges.
An error message is displayed while using sandbox every time: Error fetching sandbox
Have you tried deleting the sandbox. A new one will get created the next time you resume the course.
I have the same problem. I haven't found a solution still.
I found a solution - I just registered here: https://sandbox.neo4j.com and chose to open with NEuler. After that I was able to connect to the sandbox and everything works fine.
I registered here: https://sandbox.neo4j.com but it hasn't help
I am having the same issue, I have a registered account, verified my account, however the sandbox will not open within the courses which is making them impossible to complete
I've just signed up at https://sandbox.neo4j.com/ , refresh the course and everything is OK.
All the sessions of the conference are now available online