Copilot: I've mapped a 365 data source. Now what?

I'm experimenting with Copilot to see how it interrogates a data source.  Microsoft 365 has https://learn.microsoft.com/en-us/microsoftsearch/connectors-overview#microsoft-graph-connectors-by-microsoft so I decided to map a ServiceNow catalog.

I took the following steps:

1. Started a free trial for ServiceNow
2. Navigated to Microsoft 365 admin center -> Search & Intelligence
3. Added a https://learn.microsoft.com/en-us/microsoftsearch/servicenow-catalog-connector
4. Created a Result Type for the data source
5. Created a Vertical for the data source
6. Performed a full-crawl (source now shows as "Ready" with 144 items indexed)
7. Started a free trial for https://copilotstudio.microsoft.com/
8. Created a new Copilot instance

I (optimistically) used the "Test copilot" option to say:  "I want to change a firewall rule", hoping but not expecting, that Copilot would respond with an Adaptive Card corresponding to the "Firewall Rule Change" catalog service.

Copilot: "I'm sorry, I'm not sure how to help with that."

So, what's next?

According to this blog post, it should be possible, but I'm guessing I'm missing a step or have taken a wrong turn at some point.