GitHub Copilot Sign-In Loop in VS Code — Stuck Authenticating After Cache Corruption

What this error means

GitHub Copilot sign-in button not responding / stuck in sign-in loop — authentication provider registration timed out is a GitHub Copilot failure pattern reported for developers trying to fix github copilot getting stuck in sign-in loop in vs code after cache corruption or credential mismatch; unable to activate extension. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Sources: https://github.com/orgs/community/discussions/154128 (Mar 9, 2026), https://github.com/orgs/community/discussions/167353 (Dec 28, 2025), https://stackoverflow.com/questions/79638766. Multiple users report stuck-at-sign-in screen, broken sign-in button, extension activation timeout. Affects paying Copilot subscription users. Category: GitHub Copilot per mapping rules.

Common causes

• Sources: https://github.com/orgs/community/discussions/154128 (Mar 9, 2026), https://github.com/orgs/community/discussions/167353 (Dec 28, 2025), https://stackoverflow.com/questions/79638766. Multiple users report stuck-at-sign-in screen, broken sign-in button, extension activation timeout. Affects paying Copilot subscription users. Category: GitHub Copilot per mapping rules.

Quick fixes

1. Confirm the exact error signature matches GitHub Copilot sign-in button not responding / stuck in sign-in loop — authentication provider registration timed out.
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://github.com/orgs/community/discussions/154128
• https://github.com/orgs/community/discussions/167353
• https://stackoverflow.com/questions/79638766

Evidence note: Sources: https://github.com/orgs/community/discussions/154128 (Mar 9, 2026), https://github.com/orgs/community/discussions/167353 (Dec 28, 2025), https://stackoverflow.com/questions/79638766. Multiple users report stuck-at-sign-in screen, broken sign-in button, extension activation timeout. Affects paying Copilot subscription users. Category: GitHub Copilot per mapping rules.

Related errors

• GitHub Copilot

FAQ

What should I check first?

Start with the exact GitHub Copilot sign-in button not responding / stuck in sign-in loop — authentication provider registration timed out 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 GitHub Copilot sign-in button not responding / stuck in sign-in loop — authentication provider registration timed out.