[BUG] Cowork doesn't load into Claude app OS Build 26200.7840

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?

When I open the Claude app, I can only see Chat/Code toggled. I have enabled Hyper V on Windows 11 Pro.

What Should Happen?

I should see Co work as a tab.

Error Messages/Logs

No error. However this is the log:

2026-02-20 16:46:47 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-02-20 16:46:49 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:46:49 [info] [Callbacks] Initializing VM event callbacks...
2026-02-20 16:46:49 [error] [Callbacks] Swift VM addon not available for callbacks
2026-02-20 16:46:51 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:46:53 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:46:57 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:46:59 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:47:00 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:47:02 [warn] [startVM] VM not supported (win32/x64), skipping
2026-02-20 16:47:06 [warn] [startVM] VM not supported (win32/x64), skipping

Steps to Reproduce

N/a using the default app and version of Windows shared already.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1.3770 (f7f585)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_