Cowork "Virtualization is not available" on Windows 11 Pro 25H2 despite all features 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?

OS: Windows 11 Pro Version 25H2 (Build 26200.8037)
Claude Desktop: latest version
Features enabled:

Virtual Machine Platform ✅
Windows Hypervisor Platform ✅
Hyper-V ✅
ran bcdedit /set hypervisorlaunchtype auto ✅

What Should Happen?

Cowork should detect that virtualization is enabled and successfully initialize the workspace VM.

Error Messages/Logs

Error message: "La virtualización no está disponible — El espacio de trabajo de Claude requiere Virtual Machine Platform, pero el servicio de virtualización no responde."

Steps to Reproduce

Enable Hyper-V, Virtual Machine Platform, and Windows Hypervisor Platform in Windows Features
Run bcdedit /set hypervisorlaunchtype auto in PowerShell as administrator
Restart computer
Open Claude Desktop and navigate to Cowork tab
Error appears immediately

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.1348.0 (efa3fd) 2026-04-08T15:06:08.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_