Mobile setup fails with “Couldn’t finish secure setup” — account-specific

When pairing the ChatGPT iOS app with Codex on my computer, the authorization step fails on my phone with: "Setup failed — Couldn't finish secure setup. Try again." No further error details are shown.

Key detail: This only happens with one account . When I sign in with a different ChatGPT account on the SAME phone and SAME computer and run the exact same pairing flow, it succeeds every time. So the problem appears to be specific to the account/server-side state, not the device or network.

Steps to reproduce:

1. Start the Codex mobile pairing flow from the desktop app (QR code).
2. Scan the QR code with the iPhone and open the ChatGPT app.
3. On auth.openai.com, tap Authorize (授權).
4. The phone shows "Setup failed / Couldn't finish secure setup. Try again."

Expected: Pairing completes and the phone can access Codex on the computer.
Actual: Setup fails only for this account; a different account works fine.

What I've already tried:

• Retried multiple times (the Retry button)
• Confirmed the same device + same computer works with a different account

Environment (please confirm/fill in):

• Phone: iPhone, iOS [version]
• ChatGPT iOS app version: [version]
• Codex desktop app version (from "About Codex"): [version]
• Computer OS: [macOS / Windows + version]
• Subscription on the failing account: [Free / Plus / Pro / Team]
• Failing account

My suspicion: a stale/leftover device-pairing record on this account isn't being cleared server-side, so re-pairing can't complete. Could you clear the device/environment records for this account so I can re-pair?