Windows Browser Use fails before reading attached Chrome tab: "Unable to load browser request-header policy"

Environment

• Windows 11
• Codex desktop app
• ChatGPT browser extension for Chrome
• Chrome extension side panel opens successfully
• Chrome is shown as connected in Settings → Computer Use
• The target domains are not present in the blocked-sites list

Issue

Codex can see the metadata of an explicitly attached Chrome tab, including its tab ID and URL, but cannot connect to or read the page.

Exact error:

Unable to load browser request-header policy. Retry the browser command.

Steps to reproduce

1. Open https://vk.ru/target_vk63 in Chrome.
2. Open the ChatGPT extension side panel.
3. Open the current Codex task in the side panel.
4. Explicitly attach the selected Chrome tab to the task.
5. Ask Codex to inspect the page.
6. Browser Use fails before reading or interacting with the page.

Troubleshooting completed

• Confirmed that vk.ru and vk.com are not in the blocked-sites list.
• Restarted the Browser Use session.
• Retried direct tab connection by tab ID.
• Tried both the built-in browser and browser-extension route.
• Confirmed independently that https://vk.com/ and https://vk.ru/target_vk63 are reachable from the same computer and return HTTP 200.
• The issue occurs before target-page content is read.

Expected behavior

Codex should connect to the explicitly attached Chrome tab and either read it or display a clear site-specific permission request.

Privacy

No authentication data, cookies, access tokens, account identifiers, or page content are included in this report.

Start by reproducing the attached Chrome-tab flow on Windows and trace the Browser Use entry point that loads the browser request-header policy. Compare the built-in browser and browser-extension routes, then verify that the attached tab can be read or that a clear site-specific permission error is shown.