Issues with Node-RED chatbot tutorial

I'm following the chat assistant tutorial here using their imported code. The application works fine, except that when a message is sent it just disappears - there's no conversation history and it's not possible to communicate between different windows.

The network and console panels from inspecting the page are both completely empty. Does anyone know what I might be doing wrong? I'm not sure what the issue could be given that I'm using their exact code.

Thank you!

Start by adding debug nodes to your flow and seeing if they suggest anything. If not look at the logs