[BUG]

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?

OAuth login fails with a 500 Internal Server Error on the authorization page. The browser opens the Claude authorization page, but after clicking Authorize, the page returns a 500 error and Claude Code never completes the login flow.

Environment

• Claude Code version: 2.1.92
• Platform: Windows (PowerShell)
• Plan: Claude Max
• Terminal: PowerShell

What I've Tried

• Updated to latest version (2.1.92)
• Deleted %LOCALAPPDATA%\Claude
• Deleted %LOCALAPPDATA%\claude-cli-nodejs
• Deleted ~\.claude.json and ~\.claude\
• Retried multiple times across different PowerShell sessions
• Maximized terminal window to avoid token line-wrapping
• Manually copying the OAuth URL and pasting into browser

None of the above resolved the issue. The 500 error persists on every attempt.

What Should Happen?

Successful OAuth authentication and access to Claude Code using my Claude Max subscription.

Error Messages/Logs

Steps to Reproduce

1. Run claude in PowerShell
2. Select "Sign in with Claude.ai subscription"
3. Browser opens the Claude authorization page
4. Click Authorize
5. Page shows: Authorization failed — Internal server error
6. Claude Code never completes authentication

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.92

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_