Agent Monitoring Continuous Evaluation for Custom Agents Failing with error "No trace data found"

- **Package Name**: Agent Monitoring Continuous Evaluation
- **Package Version**:
- **Operating System**:
- **Python Version**:

**Describe the bug**
We have setup continuous monitoring via the UI for our custom agent, however evaluation run fails with this error even though traces exist:

**There was an error with this evaluation run.No trace data found where customDimensions.gen_ai.input.messages or customDimensions.gen_ai.output.messages contain data. Please check the agent running status for agent 'ifd-mono' during time range: from 2026-07-02T05:50:08+00:00 to 2026-07-02T06:50:08+00:00**

**To Reproduce**
Set up monitoring for your custom agents
1. Onboard your custom agent to Foundry using the instructions in [Register and manage custom agents](https://learn.microsoft.com/en-us/azure/foundry/control-plane/register-custom-agent).
2. Instrument your agent to comply with the [semantic conventions for generative AI solutions in the OpenTelemetry standard](https://opentelemetry.io/docs/specs/semconv/gen-ai/).
3. Configure your agent to send telemetry to the same Application Insights instance as your Foundry project to enable continuous evaluation features.
4. In Foundry Control Plane, go to the Asset page and select your agent.
5. Select the Monitor tab to view your metrics and charts.
6. Set up continuous evaluations using the methods outlined in [Configure settings](https://learn.microsoft.com/en-us/azure/foundry/observability/how-to/how-to-monitor-agents-dashboard?tabs=python#configure-settings).

**Note: We only implemented the configure settings via the UI and didn't create the python implementation as we understood it achieves the same thing?**

**Expected behavior**
A clear and concise description of what you expected to happen.
Evalution result should appear in the Evaluation page successfully

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Additional context**
See user_log attached

[user_logs (12).txt](https://github.com/user-attachments/files/29587816/user_logs.12.txt)