Adaptive Card was not displayed

[stephenzeng]

What sample tool are you using?
assistant-ui-mcs

Describe the bug
It did not show anything when the agent sent a simple message in an adaptive card.

To Reproduce
Steps to reproduce the behavior:

1. In the Greeting topic, add a message with an adaptive card, e.g. { "type": "AdaptiveCard", "$schema": "https://adaptivecards.io/schemas/adaptive-card.json", "version": "1.5", "body": [ { "type": "TextBlock", "text": "Hello. This is an adaptive card.", "wrap": true } ] }
2. Publish the agent, trigger the topic by sending message "Hello"

Expected behavior
I should be able to see the adpative card content from the client side.