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docs: add troubleshooting for ChatGPT token exchange 403 unsupported region errors #8

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gaoguobin merged 1 commit into from
May 20, 2026
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docs: add troubleshooting for ChatGPT token exchange 403 unsupported region errors #8

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12 changes: 12 additions & 0 deletions README.md
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Expand Up @@ -139,6 +139,18 @@ net start winnat
netsh interface ipv4 show excludedportrange protocol=tcp
```

If ChatGPT login fails with `Token exchange failed ... 403 Forbidden: Country, region, or territory not supported`,
verify routing before retrying:

- Confirm proxy status is ready, including `needs_restart=false`.
- Confirm provider auth prep/split already completed.
- Ensure your system proxy / VPN setup (including TUN mode if needed) captures Codex App/WebView
login traffic, not only model provider traffic.
- Temporarily disable route/proxy switchers (for example `ccswitch`) that can override or split
login routing.
- Treat this as an OpenAI region/routing rejection during OAuth token exchange, which is separate
from third-party provider auth failures.

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