VS Code extension 26.721.30844 crashes after successful ChatGPT login on Windows

Environment

• Windows x64
• VS Code
• Broken Codex extension version: 26.721.30844
• Last known working version: 26.715.31925

Steps to reproduce

1. Install Codex extension version 26.721.30844.
2. Open the Codex panel.
3. Sign in with ChatGPT.
4. Wait for the Codex panel to reload.

Expected behavior

The Codex interface opens after authentication.

Actual behavior

The panel displays “Oops, an error has occurred” with a “Try again” button.

The logs show authentication completing successfully:

[chatgpt-account-lookup] completed authenticatedAccountPresent=true authMethod=chatgpt hasEverErrored=false result=succeeded windowType=extension

Immediately afterward, the extension receives a forbidden response:

Error fetching httpStatus=403 requestId=<redacted> statusText=Forbidden url=/settings/user

The React application then enters its error boundary with name=AppRoutes.

Troubleshooting performed

• Logged out completely and signed in again.
• Uninstalled and cleanly reinstalled the latest extension.
• Fully restarted VS Code.

The issue persisted with 26.721.30844.

Workaround

Downgrading to 26.715.31925 restores normal operation with the same ChatGPT account and workspace.