.NET: `AgentWithHostedMCP` chat fails: `ErrorHTTP 404 (: 404) Resource not found`

[Menghua1]

Description:
After deploying AgentWithHostedMCP, chatting in the Agent Playground on the Foundry Portal fails with the error:
"ErrorHTTP 404 (: 404) Resource not found."

In addition, running Pytest also fails with the error "ID cannot be null or empty (Parameter 'id')", as shown below:

Steps to Reproduce:

1. Initialize the project: azd init --template Azure-Samples/ai-foundry-starter-basic.
2. Initialize AI agent: azd ai agent init -m https://github.com/microsoft/agent-framework/blob/main/dotnet/samples/HostedAgents/AgentWithHostedMCP/agent.yaml and select location northcentralus.
3. Run azd up.
4. Navigate to agent playground on the Foundry Portal and enter "How do I create an HTTP-triggered Azure Function in Python?" in the chat.
5. For pytest, copy the folder tests to the root directory.
6. Create a new .env file and add the following content.

AZURE_AI_PROJECT_ENDPOINT=""https://ai-account-bvmg7v2ge46ec.services.ai.azure.com/api/projects/ai-project-mhweb2""
AGENT_VERSION=1
AGENT_TEST_MESSAGE="How do I create an HTTP-triggered Azure Function in Python?"
AGENT_KIND=hosted
AGENT_NAME="WebSearchAgent"

7. Run cd tests and pytest test_agent.py -v -s.

Environment:

• Azd version: azd version 1.23.0-beta.1-daily.5744372 (commit 35c7b9a4a09b4a26b2e99b830746799c49f53fd3).
• AI Agent Extension version: 0.1.5-preview
• Agent: AgentWithHostedMCP
• OS: Windows
• Location: northcentralus.

Expected Behavior:
Chatting is successful on the agent playground, and pytest also works successfully.

@JeffreyCA and @rajeshkamal5050 for notification.

[Menghua1]

@JeffreyCA and @rajeshkamal5050 Based on testing with the latest 0.1.6-preview version of the AI ​​Agent Extension, this issue still exists.

Environment:

• Azd version: azd version 1.24.0-beta.1-daily.5788142 (commit 626a938f228e00f75f282cfba7a271c6d871e710).
• AI Agent Extension version: 0.1.6-preview
• Agent: AgentWithHostedMCP
• OS: Windows
• Location: northcentralus.