[BUG] Claude in Chrome extension OAuth fails - "Authorization failed" with chrome-extension:// redirect_uri rejected by server

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?

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude in Chrome extension OAuth authorization fails with "Authorization failed - This isn't working right now" immediately after clicking Authorize.

Steps to Reproduce

1. Install Claude in Chrome extension (fcoeoabgfenejglbffodgkkbkcdhcgfn)
2. Open Claude Code and enable the Claude in Chrome connector
3. Click the extension icon to authorize
4. Browser opens claude.ai/oauth/authorize
5. Click Authorize → immediately shows "Authorization failed"

Evidence

The OAuth URL generated is correct and contains all required parameters:
https://claude.ai/oauth/authorize?client_id=dae2cad8-15c5-43d2-9046-fcaecc135fa4&response_type=code&scope=user%3Aprofile+user%3Ainference+user%3Achat&redirect_uri=chrome-extension%3A%2F%2Ffcoeoabgfenejglbffodgkkbkcdhcgfn%2Foauth_callback.html&state=...&code_challenge=...&code_challenge_method=S256

The server rejects the redirect_uri:
chrome-extension://fcoeoabgfenejglbffodgkkbkcdhcgfn/oauth_callback.html

Expected Behavior

OAuth completes successfully and Claude in Chrome connects to Claude Code.

Environment

• Claude Code Version: v2.1.179
• Claude in Chrome Extension: latest
• Browser: Chrome (latest)
• OS: Windows
• Plan: Claude Pro ($20/month)
• Related issues: #17786, #17790, #38664

Additional Notes

• Claude Code OAuth login works fine using incognito window workaround
• The redirect_uri format chrome-extension:// is not whitelisted on claude.ai server side
• oauth_callback.html appears to be missing from extension package

What Should Happen?

Clicking "Authorize" should complete the OAuth flow, redirect to oauth_callback.html, store the access token, and allow Claude in Chrome extension to connect successfully to Claude Code.

Error Messages/Logs

Steps to Reproduce

1. Install Claude in Chrome extension from Chrome Web Store
2. Install Claude Code (v2.1.179) and log in successfully
3. In Claude Code, run /connectors and enable Claude in Chrome
4. Click the extension icon in Chrome toolbar to authorize
5. Browser opens claude.ai/oauth/authorize with valid parameters including client_id
6. Page immediately shows "Authorization failed - This isn't working right now"

(Never reaches the Authorize button stage)

Note: Opening the same OAuth URL in an incognito window shows "Authorization failed" as well.
The redirect_uri chrome-extension://fcoeoabgfenejglbffodgkkbkcdhcgfn/oauth_callback.html appears to not be whitelisted on the server side.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.179

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_