GitHub Copilot Chat PermissiveAuthRequiredError Sign-In Loop in VS Code

What this error means

PermissiveAuthRequiredError: Permissive authentication is required | GitHubLoginFailed Failed to fetch models is a GitHub Copilot failure pattern reported for developers trying to fix github copilot chat stuck in persistent sign-in loop despite active copilot subscription; resolve permissiveauthrequirederror in vs code. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

DevActivity documented persistent auth loop affecting both Linux (Fedora) and Windows 11 environments. Verified with active Copilot Pro+ subscription. Root cause likely backend stable-client-specific issue. Reproduced in VS Code stable version (Insiders works). Directly blocks paying subscribers from using paid feature — strong commercial value. Category: GitHub Copilot per SKILL.md rules.

Common causes

• DevActivity documented persistent auth loop affecting both Linux (Fedora) and Windows 11 environments. Verified with active Copilot Pro+ subscription. Root cause likely backend stable-client-specific issue. Reproduced in VS Code stable version (Insiders works). Directly blocks paying subscribers from using paid feature — strong commercial value. Category: GitHub Copilot per SKILL.md rules.

Quick fixes

1. Confirm the exact error signature matches PermissiveAuthRequiredError: Permissive authentication is required | GitHubLoginFailed Failed to fetch models.
2. Check the GitHub Copilot account, local tool state, and provider configuration involved in the failing workflow.
3. Verify the account session, API key, provider settings, and environment where the failing tool is running.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://devactivity.com/insights/solving-the-persistent-github-copilot-chat-sign-in-loop-in-vs-code/
• https://learn.microsoft.com/en-us/answers/questions/5792053/github-copilot-authentication-bug-continue-with-un

Evidence note: DevActivity documented persistent auth loop affecting both Linux (Fedora) and Windows 11 environments. Verified with active Copilot Pro+ subscription. Root cause likely backend stable-client-specific issue. Reproduced in VS Code stable version (Insiders works). Directly blocks paying subscribers from using paid feature — strong commercial value. Category: GitHub Copilot per SKILL.md rules.

Related errors

• GitHub Copilot

FAQ

What should I check first?

Start with the exact PermissiveAuthRequiredError: Permissive authentication is required | GitHubLoginFailed Failed to fetch models text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed GitHub Copilot workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without PermissiveAuthRequiredError: Permissive authentication is required | GitHubLoginFailed Failed to fetch models.