[BUG]Cowork tab not showing on Windows 11 Education 25H2 (Build 26200.8117) — yukonSilver marked as unsupported despite Hyper-V enabled

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Cowork tab does not appear in Claude Desktop on Windows 11 Education 25H2 (Build 26200.8117). Only Chat and Code tabs are visible. Hyper-V is fully enabled and CoworkVMService is running correctly.

What Should Happen?

The Cowork tab should appear and be functional alongside Chat and Code tabs.

Error Messages/Logs

No log file found — %APPDATA%\Claude\logs\cowork_vm_node.log does not exist.
This indicates the VM is never being initialized.

Steps to Reproduce

1. Install Claude Desktop on Windows 11 Education 25H2 (Build 26200.8117)
2. Enable Hyper-V via PowerShell (Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-All -All)
3. Verify CoworkVMService is Running
4. Launch Claude Desktop
5. Only Chat and Code tabs appear — Cowork tab is missing entirely

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

N/A - Using Claude Desktop app

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

OS: Windows 11 Education 25H2 Build 26200.8117
Hyper-V: Enabled and Running (Get-Service vmms = Running)
CoworkVMService: Running
Clean reinstall performed — issue persists
cowork_vm_node.log does not exist — VM never initializes
Related issues: #25136, #36365