Codex desktop and CLI return 404 from /backend-api/codex/responses in TPE region

What version of the Codex App are you using (From “About Codex” dialog)?

codex-cli 0.153.0-alpha.5

What subscription do you have?

Pro

What platform is your computer?

Mac

What issue are you seeing?

After updating the ChatGPT/Codex desktop app, Codex stopped working on both of my Macs.

The bundled Codex version is:

codex-cli 0.153.0-alpha.5

The same issue also occurs through an independently installed Codex CLI. The WebSocket connection fails and falls back to HTTPS, but both transports return 404:

unexpected status 404 Not Found: Unknown error
Endpoint: https://chatgpt.com/backend-api/codex/responses

Cloudflare Ray IDs:

a355ae93ab9c8092-TPE

a355aec39e48ed1d-TPE

codex doctor reports:

18 ok

1 idle

5 notes

4 warnings

0 failures

Overall status: degraded

The official CLI installer endpoint also returned HTTP 404 from my network. Regular ChatGPT web access continues to work.

Because the same problem occurs on two Macs and through both the desktop app and CLI, this appears to be a Codex backend routing or account provisioning issue rather than a local installation problem.

Please investigate the /backend-api/codex/responses route for my account or the TPE region.

What steps can reproduce the bug?

nothing else just open up the app and as soon you input any question then you will see error message

What is the expected behavior?

No response

Additional information

No response

Start by reproducing the 404 from https://chatgpt.com/backend-api/codex/responses with both the bundled and independently installed Codex CLI, and review the reported codex doctor status. Investigate whether routing or account provisioning affects the TPE region; done means Codex requests work through both WebSocket fallback and HTTPS without the 404.