# GitHub Copilot: Intermittent errors with app installation token authentication

> GitHub Copilot status incident “Intermittent errors with app installation token authentication” on 2026-05-23: impact minor (vendor’s label), 3.5 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/github-copilot/incidents/k5z4d1v1tqmt
Last updated: 2026-05-23T19:32:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2026-05-23 16:00 UTC · Resolved: 2026-05-23 19:32 UTC · Duration: 3.5 h
- Updates: 1
- [Vendor status page: https://www.githubstatus.com/incidents/k5z4d1v1tqmt](https://www.githubstatus.com/incidents/k5z4d1v1tqmt)
- [Company: GitHub Copilot](https://rewindex.com/company/github-copilot.md)

## Timeline of updates

- **resolved** 2026-05-23 19:32 UTC: On May 23, 2026 between 06:00 UTC and 19:12 UTC, GitHub experienced intermittent errors authenticating GitHub app installation tokens . During this time, between 1-5% of app installation token authentication requests failed, with an average of 2.3% and the error rate peaking at approximately 5.4% around 14:00 UTC. Users may have experienced authentication failures when using GitHub Apps, including failures in Git operations and API calls using app installation tokens. The issue was caused by an issue in a caching proxy component and was remediated by rolling back that component to a previous version. We are taking steps to improve monitoring for cache miss anomalies to ensure that token authentication remains functional during infrastructure changes and reviewing our protocol for testing and when we upgrade third-party dependencies.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by GitHub Copilot, started 2026-05-23 16:00 UTC, resolved after 3.5 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/github-copilot/incidents/k5z4d1v1tqmt
- Citation: GitHub Copilot, “Intermittent errors with app installation token authentication” (2026-05-23 16:00 UTC). Archived by Rewindex: https://rewindex.com/company/github-copilot/incidents/k5z4d1v1tqmt (CC BY 4.0).
- Markdown link: `[GitHub Copilot: Intermittent errors with app installation token authentication (2026-05-23)](https://rewindex.com/company/github-copilot/incidents/k5z4d1v1tqmt)`


---
Canonical: https://rewindex.com/company/github-copilot/incidents/k5z4d1v1tqmt · Markdown: https://rewindex.com/company/github-copilot/incidents/k5z4d1v1tqmt.md · JSON: https://rewindex.com/api/v1/companies/github-copilot/incidents/k5z4d1v1tqmt · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-05T14:06:54.717Z