GHModelAI - DEVUI does not display outputs

[wyarcdev]

I am trying to run through the dotnet sample for this:
https://github.com/microsoft/Agent-Framework-Samples/tree/main/09.Cases/GHModel.AI

Expected:

Output messages are shown as seen in the article screenshot

Actual:

No output messages shown:

Version info:
"Microsoft.Agents.AI.DevUI" Version 1.6.1-preview.260514.1