I have taken your advise. Started the Sandbox and re-ran the query and it works.
The problem is that I was led to believe that I should enter my query on the automatic browser window that was created alongside the question. This clearly does not appear to work.
We do have some users who do not see the $neo4j prompt in the embedded sandbox for the course. Sometimes it takes a while to appear as it is waiting to connect to the sandbox instance. Sometimes refreshing the page will allow it to appear. Worst case scenario is to go to the sandbox.neo4j.com site and open a Neo4j Browser for the sandbox for the course. The Cypher Fundamentals course uses the Movie sandbox.