I added a Fabric data agent in my Copilot Studio agent. I was able to connect, locate the data agent. However I cannot trigger the data agent -the topics do not have an action for the data agent. When I invoke it from the Copilot Studio Overview page, I can see it get called, however it does not return an answer. In Fabric, the data agent works well, it returns correct answers. How can I get the data agent to return the answer to the Copilot Studio agent?