Ensure to copy your n8n workflow and paste it in the code block, that is in between the pairs of triple backticks, which also could be achieved by clicking </> (preformatted text) in the editor and pasting in your workflow.
```
<your workflow>
```
That implies to any JSON output you would like to share with us.
Make sure that you have removed any sensitive information from your workflow and include dummy or pinned data with it!
Using a trial account might have limitation using AI nodes. I wonder if you copied/pasted the workflow from some other workflows. If so, try adding a “fresh” Chat trigger node from the list of nodes an see if the “Make Chat Publicly Available” toggle appears there.
Here’s the two chat nodes along each other - one from your workflow I copied and the other placed from the library of nodes on the canvas. See the coloration difference too
