GitHub Copilot Returns Forbidden Access After Few Messages — Token Expired or License Check Failing Mid-Session

What this error means

Forbidden: Access to this endpoint is forbidden — occurs after 2-3 messages using Sonnet 4.5 or other models is a GitHub Copilot failure pattern reported for developers trying to fix github copilot ‘forbidden’ error that interrupts sessions mid-use; requires re-authentication or license renewal without restarting the ide. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Reported in anomalyco/opencode#26344 (open, created 2026-05-08). User with Copilot Pro license gets ‘Forbidden’ error after just 2-3 messages on Ubuntu 24.04. Indicates session token expiry or license validation race condition. High frustration factor for paid subscribers. Category mapping: GitHub Copilot → GitHub Copilot per SKILL.md exact mapping.

Common causes

• Reported in anomalyco/opencode#26344 (open, created 2026-05-08). User with Copilot Pro license gets ‘Forbidden’ error after just 2-3 messages on Ubuntu 24.04. Indicates session token expiry or license validation race condition. High frustration factor for paid subscribers. Category mapping: GitHub Copilot → GitHub Copilot per SKILL.md exact mapping.

Quick fixes

1. Confirm the exact error signature matches Forbidden: Access to this endpoint is forbidden — occurs after 2-3 messages using Sonnet 4.5 or other 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://github.com/anomalyco/opencode/issues/26344

Evidence note: Reported in anomalyco/opencode#26344 (open, created 2026-05-08). User with Copilot Pro license gets ‘Forbidden’ error after just 2-3 messages on Ubuntu 24.04. Indicates session token expiry or license validation race condition. High frustration factor for paid subscribers. Category mapping: GitHub Copilot → GitHub Copilot per SKILL.md exact mapping.

Related errors

• GitHub Copilot

FAQ

What should I check first?

Start with the exact Forbidden: Access to this endpoint is forbidden — occurs after 2-3 messages using Sonnet 4.5 or other 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 Forbidden: Access to this endpoint is forbidden — occurs after 2-3 messages using Sonnet 4.5 or other models.