Accessing Default agent

Hello

Im following

I'm trying to access the Elastic AI Agent Builder via Kibana, but I'm getting a 404 error when visiting this

POST kbn://api/agent_builder/converse

{

"input": "what is our top portfolio account?"

}

Should I have to do any specific configuration to try it out? I thought its a default agent so nothing need to be done.

Can someone please help?