Github has a known issue

Incident Report for App Center

Resolved

This incident has been resolved.
Posted Jul 31, 2021 - 02:03 UTC

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Jul 31, 2021 - 01:50 UTC

Identified

App Center is currently experiencing issues with GitHub repositories. Please also refer to https://status.github.com for updates. We apologize for the inconvenience while we work to resolve this issue.
Posted Jul 31, 2021 - 01:34 UTC
This incident affected: Build.