MCP connection fails when a Windows account with CloudAP authentication is used

How to reproduce:

1. Ensure your Windows account uses CloudAP authentication (“[System.Security.Principal.WindowsIdentity]::GetCurrent().AuthenticationType” in the PowerShell returns “CloudAP”)
2. Create a new project
3. Install the Assistant package
4. Open “Project Settings → AI → Unity MCP Server” and ensure that the Unity Bridge is running
5. Try to connect an AI client to the MCP server
6. Observe the AI Client and the Console

Actual result: MCP connection fails
Expected result: MCP connection is successful

Reproducible with: 2.6.0-pre.1 (6000.3.8f1) (by the user)

Reproducible on: Windows 11 (by the user)
Not reproducible on: No other environments tested

Note: Not reproducible by CQA, tested on Windows 11 using an account with a “WORKGROUP” domain and “CloudAP” authentication type