github@claude-plugins-official fails to authenticate - connects to incompatible GitHub Copilot endpoint

Description

The github@claude-plugins-official plugin fails to authenticate with error:
"Incompatible auth server: does not support dynamic client registration"

Environment

• Claude Code version: 2.1.12
• OS: Windows
• Plugin: github@claude-plugins-official (enabled in ~/.claude/settings.json)

Error Details

Status: failed
Auth: not authenticated
URL: https://api.githubcopilot.com/mcp/
Error: Incompatible auth server: does not support dynamic client registration

Expected Behavior

The GitHub plugin should authenticate successfully, either:

1. Using standard GitHub API (api.github.com) instead of Copilot endpoint
2. Or supporting GitHub Copilot's OAuth flow

Workaround

Disabling the plugin removes the error, but loses GitHub functionality.