[BUG] Cowork fails on Windows 11 Home with Team plan: RPC error -1 - Plan9 mount failed: bad address

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 fails to start on Windows 11 Home when using the Team plan. The following error is reported:

RPC error -1: failed to ensure virtiofs mount: Plan9 mount failed: bad address

Key finding:

• Windows 11 Home + Team plan → Does NOT work
• - Windows 11 Home + Personal plan → Works correctly

This suggests the issue is specific to the combination of Windows 11 Home and the Team plan.

What Should Happen?

Cowork should start and function normally on Windows 11 Home regardless of the subscription plan (Team or Personal).

Error Messages/Logs

RPC error -1: failed to ensure virtiofs mount: Plan9 mount failed: bad address

Steps to Reproduce

1. Have a Windows 11 Home machine
2. 2. Subscribe to the Team plan
3. 3. Install Claude Code and try to use Cowork
4. 4. Error appears: RPC error -1: failed to ensure virtiofs mount: Plan9 mount failed: bad address

Note: The same machine works correctly when using the Personal plan instead of the Team plan.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Unknown (not specified in bug report)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Troubleshooting already attempted (none resolved the issue):

• App restart
• - PC restart
• - - Workspace reinstall

Subscription plan impact:

• Team plan → Error occurs
• - Personal plan → Works fine on the same machine

This strongly suggests a plan-specific configuration or permission difference is causing the virtiofs mount to fail on Windows 11 Home.