403 error when creating a normal ChatGPT conversation in the macOS Codex app

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

Version 26.707.51957

What subscription do you have?

Plus

What platform is your computer?

macOS

What issue are you seeing?

Submission ID (019f55fa-e530-7e00-a7fe-c96e3c0b1bd6)

Creating a normal ChatGPT conversation in the macOS Codex app via Option–Command–N consistently returns HTTP 403. Codex tasks still work normally, and the ChatGPT app on my iPhone works with the same account.
The macOS log shows: “Unusual activity has been detected from your device. Try again later.”
I have not used automation or generated unusual traffic; I only communicated normally through Codex. Please check whether my macOS app session or device was incorrectly flagged.
OpenAI request ID: c2abbb80-b092-4e92-b364-e31a06eb67ae
Earlier request ID: 93ae1cb6-2c0a-4de9-9cd7-d7ad55ec5d88
Date: July 12, 2026
Region/time zone: Germany, Europe/Berlin
Please let me know whether I should reset the local app session or wait for a server-side restriction to be removed.

What steps can reproduce the bug?

since a few minutes/hours

Open new Qucikchat wit Option-Cmd-N, enter text and get the 403 error

<img width="1297" height="872" alt="Image" src="https://github.com/user-attachments/assets/cb95b8f1-6386-42c3-8c87-1d96ca25edbb" />

What is the expected behavior?

_No response_

Additional information

_No response_