/login shows "Login successful" but immediately reverts to "Not logged in"

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?

After running /login, it displays "Login successful" but the status bar still shows "Not logged in · Run /login". Any subsequent command fails with "Not logged in".

What Should Happen?

After successful login, authentication should persist and allow normal usage.

Error Messages/Logs

No error messages. /compact also failed with: EPERM: operation not permitted

Steps to Reproduce

1. Open Claude Code on Windows
2. Run /login
3. See "Login successful"
4. Type any message
5. Get "Not logged in · Please run /login"

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.92

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Subscription: Claude Pro. Installed via winget. Previously used npm install but migrated. Deleted .claude folder, reinstalled, ran as administrator — login succeeds every time but auth is never persisted.