The
error "codex token exchange failed: token endpoint returned status 403 forbidden" means that the client was denied access when exchanging tokens to the server during the OAuth authorization process. A 403 indicates that the server understands the request but refuses to execute it, often due to insufficient account permissions, invalid tokens, network proxy, or extended version issues.
1. Account Permissions and Subscription Issues
403 error usually means that the account does not have access to the corresponding service. For example, GitHub Copilot or Codex features require an active subscription and will be rejected if the permissions are insufficient. You can confirm that it is healthy by checking the subscription status and GitHub-authorized apps.
- Re-log in and clear the cache
If the account is confirmed to have permissions, you can try to log out and clear the cache. Revoking authorization in GitHub → Settings → Applications, and then logging back in in the plugin or VS Code solves most invalid or expired token issues.
- Extensions and version updates
Older versions of extensions or plugins are more likely to trigger 403 in remote/container environments. Upgrading to the latest version and ensuring that Codex or Copilot plugins are updated in sync with the IDE can avoid compatibility issues.
- Network and system environment check
Network proxies, firewalls, or VPNs can block the OAuth process. Try logging in under a proxyless network and ensure that the local time is synchronized accurately, otherwise the signature verification will fail. In addition, when logging in in a remote development container or SSH environment, you need to ensure that the container has direct access to the public network.
- Final troubleshooting method
If the error is still reported after the above steps, you can collect the debug log and submit it to the official issue. In most cases, it is caused by organizational policies or system environment, and officials can analyze specific failure points through logs.
Frequently Asked Questions (Q&A)
Q: Is the account not logged in when I get a 403 error?
A: No, a 403 indicates that a request has been made but the token exchange is denied, possibly due to insufficient permissions or invalid tokens.
Q: What if I have a subscription or a 403?
A: It is recommended to log out, clear the cache, reauthorize, and confirm that the plug-in version is up to date.
Q: What should I do if I keep failing in a remote container environment?
A: Complete the registration on the machine or use the device code to ensure that the container can be directly connected to the external network, otherwise the token cannot be exchanged.
