[BUG] GitHub connector fails to register OAuth client ("No se pudo registrar con el servicio de inicio de sesión de GitHub")

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When trying to connect the GitHub connector from Claude desktop app (Settings → Connectors → Add → GitHub), the OAuth flow fails immediately with:

"No se pudo registrar con el servicio de inicio de sesión de GitHub. Puedes intentarlo de nuevo o agregar un ID de cliente OAuth en la configuración del conector."
("Could not register with the GitHub login service. You can try again or add an OAuth client ID in the connector configuration.")

This happens every time I try to connect, with a new reference ID each attempt:

• ofid_bd465599733a4a62
• ofid_b80143fc7e6996d2
• ofid_c974a82f9050e7f1

Steps to reproduce:

1. Open Claude desktop app → Settings → Connectors
2. Click "Agregar" → search "GitHub" → select it
3. Click "Otorgar acceso a GitHub"
4. A new browser tab opens asking to complete GitHub login
5. It fails with the error above before completing

Additional context: I also had a leftover custom connector pointing to a repo URL (https://github.com/EdgarArtificialab/ClaudeRutines.git) instead of a valid MCP server endpoint, which failed separately with "Verifica que la URL apunte a un servidor MCP válido" — expected, since that connector was misconfigured. The main issue is the official GitHub connector's OAuth dynamic client registration failing server-side.

Platform: Windows 11, Claude desktop app
Date: 2026-07-04

What Should Happen?

The GitHub connector should successfully complete OAuth registration and connect, allowing repositories to be listed and selected in Rutinas/Code without any error.

Error Messages/Logs

No se pudo registrar con el servicio de inicio de sesión de GitHub. Puedes intentarlo de nuevo o agregar un ID de cliente OAuth en la configuración del conector.

Reference IDs from repeated attempts:
ofid_bd465599733a4a62
ofid_b80143fc

Steps to Reproduce

1. Open Claude desktop app → Settings → Connectors
2. Click "Agregar" (Add) → search "GitHub" → select the official GitHub connector
3. Click "Otorgar acceso a GitHub" (Grant access to GitHub)
4. A new browser tab opens asking to complete GitHub login
5. It fails immediately with: "No se pudo registrar con el servicio de inicio de sesión de GitHub"
6. Retried multiple times over ~20 minutes, each attempt returns a new reference ID but the same error

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A - this is the Claude desktop app (Windows), not the Claude Code CLI

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

This is affecting the "Rutinas" (Routines) / Code feature in Claude.ai, which requires connecting a GitHub repository. Without a working GitHub connector, this feature is unusable.