Update- Here is the 3 step which is missing in the doc for adding eventGrid, let us know if you have any other specific questions we can help with.
- Register an EventGrid Webhook for the IncomingCall Event that points to your DevTunnel URI ex. https://<devtunnelurl>/api/incomingCall.
- Instructions https://learn.microsoft.com/en-us/azure/communication-services/concepts/call-automation/incoming-call-notification
- Once that's completed you should have a running application. The best way to test this is to place a call to your ACS phone number and talk to your intelligent agent.
Hope this helps, Let us know.