Sandbox in Cypher Fundamentals online course

Hello, I am new to Neo4J. I am taking Cypher Fundamentals online training courses. The sandbox window that is part of the online training course browser to perform challenge exercises is not working. I am not sure how to activate it or connect to a server so that I can execute Cypher query commands to get credit for the challenge exercises. I am stuck. Can someone let me know what should I do to get the sandbox window in the online training courses working? Thanks a lot.

Just wanted to say, I had the same experience.

Didn't realize you actually need to login to your sandbox first (i.e. sandbox.neo4j.com )

The course doesn't really mention that, and it just 'silently' fails when you put in any command.

Anyways thanks for the advice!