Codex mobile cannot reconnect after desktop-side paired phone is deleted; iOS keeps stale offline Windows host

What version of the Codex App are you using?

Unknown from the screenshots. The issue is reproducible on Codex Desktop for Windows with the current mobile remote-control / Connections UI.

Platform

• Computer: Windows, Codex Desktop
• Mobile: ChatGPT / Codex on iOS
• Same ChatGPT account on desktop and mobile

What issue are you seeing?

Codex mobile remote control had previously paired successfully with this Windows desktop. The problem started after the phone/device entry was accidentally deleted from the Codex Desktop side.

After that, the desktop and phone appear to disagree about the pairing state:

• Codex Desktop -> Connections -> Control this computer shows no devices under "Devices that can control this computer".
• "Allow discovery and control this device" is enabled.
• The desktop can generate a fresh QR code from the Add device flow.
• ChatGPT iOS still shows the old Codex Desktop host record as disconnected/offline.
• Scanning a fresh QR code does not create a clean new pairing.
• The iOS flow appears to keep/reuse the stale old host record.
• Attempting to finish setup fails with: Setup failed / Couldn't finish secure setup. Try again.
• In Chinese UI this is shown as: 设置失败 / 无法完成安全设置。请重试。

Steps to reproduce

1. Pair ChatGPT iOS / Codex mobile remote control with Codex Desktop on Windows.
2. Confirm the mobile connection works.
3. On Codex Desktop, remove/delete the paired phone/device from Connections.
4. Open ChatGPT iOS again.
5. Observe that the old Codex Desktop host is still present on iOS as disconnected/offline.
6. On desktop, open Connections -> Control this computer -> Add and generate a fresh QR code.
7. Scan the fresh QR code with iOS.
8. Try to reconnect / complete secure setup.

Expected behavior

One of the following recovery paths should work:

• The stale mobile/account-side host record should be invalidated when the desktop-side pairing is removed.
• ChatGPT iOS should expose a visible "Forget/remove this computer" action for stale Codex Desktop hosts.
• Scanning a fresh QR code should create a clean new pairing and replace any stale enrollment state.
• If setup cannot complete, the error should explain whether this is stale state, MFA/security setup, account mismatch, or network connectivity.

Actual behavior

The desktop no longer lists the phone, but iOS still lists the old Windows desktop host. A fresh QR scan does not recover the pairing, and iOS fails with Setup failed / Couldn't finish secure setup. Try again.

Additional context

This looks related to stale mobile host / enrollment state reported in these issues:

• #25559
• #22714
• #22802
• #23112
• #22715

Screenshots are available, but the raw screenshots include a QR code and host identifier, so I am not attaching them publicly without redaction.