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claude-code - 💡(How to fix) Fix [BUG] Cowork tab missing on Windows 11 Enterprise x64 — yukonSilver marked "unsupported" despite Hyper-V running [1 comments, 2 participants]

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anthropics/claude-code#48387•Fetched 2026-04-16 07:01:37
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Error Message

The Cowork VM log (cowork_vm_node.log) repeats the same error on every app launch:

Error Messages/Logs

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Preflight Checklist

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

What's Wrong?

Cowork tab does not appear in Claude Desktop on Windows 11 Enterprise (23H2, Build 22631.6936). Only "Chat" and "Code" tabs are visible.

Hyper-V is fully enabled and the vmms service is running. The system meets all known requirements.

The Cowork VM log (cowork_vm_node.log) repeats the same error on every app launch:

[cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle... [VM] Loading vmClient (TypeScript) module... [VM] Module loaded successfully

The VM module loads but the platform check fails, preventing the Cowork tab from appearing and the VM from booting.

Environment:

  • Claude Desktop: MSIX install (Claude_pzs8sxrjxfjjc)
  • Windows 11 Enterprise 23H2 (Build 22631.6936)
  • Architecture: x64
  • Hyper-V: Enabled, vmms service running
  • Plan: Pro
  • Clean reinstall attempted: No change

Related issues: #25136, #25142, #25205, #25692

What Should Happen?

The Cowork tab should appear next to "Chat" and "Code" in the sidebar. The yukonSilver platform check should recognize Windows 11 Enterprise x64 with Hyper-V enabled as a supported configuration. The VM should boot and the Cowork session should start without errors.

Error Messages/Logs

Steps to Reproduce

  1. Install Claude Desktop from claude.ai/download on Windows 11 Enterprise x64 (23H2, Build 22631.6936)
  2. Ensure Hyper-V is enabled (Get-Service vmms returns Running)
  3. Sign in with a Pro plan account
  4. Observe that only "Chat" and "Code" tabs appear in the sidebar. No "Cowork" tab.
  5. Check the log at %LOCALAPPDATA%\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude\logs\cowork_vm_node.log
  6. Log shows yukonSilver not supported (status=unsupported) on every launch
  7. Quit and reopen the app. Same result. The Cowork tab never appears.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.101

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

No response

extent analysis

TL;DR

The issue might be resolved by updating the platform check to recognize Windows 11 Enterprise x64 with Hyper-V enabled as a supported configuration for the yukonSilver platform.

Guidance

  • The error message yukonSilver not supported (status=unsupported) suggests that the platform check is failing, preventing the Cowork tab from appearing.
  • Verify that the Hyper-V configuration and Windows version are correctly detected by the Claude Desktop application.
  • Check the related issues (#25136, #25142, #25205, #25692) for potential workarounds or fixes that may apply to this scenario.
  • Consider reaching out to the development team or support for further assistance, as this issue appears to be a regression and may require an update to the application.

Notes

The exact cause of the issue is unclear, but it seems to be related to the platform check failing to recognize the Windows 11 Enterprise x64 configuration with Hyper-V enabled. Without more information about the platform check or the yukonSilver platform, it's difficult to provide a more specific solution.

Recommendation

Apply workaround: Since the issue is a regression and the last working version is not specified, it's recommended to wait for an update to the Claude Desktop application that addresses this issue or to reach out to the development team for further assistance.

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