Mobile remote control fails with 'GitHub repository access check failed' for private repositories

Bug Description

When attempting to use Claude Code mobile remote control on a private repository, the mobile app shows:

메시지 전송 실패 GitHub repository access check failed — re-authorize GitHub in settings

Steps to Reproduce

1. Connect GitHub account on claude.ai web settings
2. Open Claude mobile app
3. Try to remotely control a Claude Code session running in a private repository
4. Error appears immediately

Expected Behavior

Remote control should work for private repositories that the authenticated GitHub user owns.

Actual Behavior

• Error: "GitHub repository access check failed — re-authorize GitHub in settings"
• Re-authorizing GitHub on claude.ai does not fix the issue
• The GitHub App (Claude by Anthropics) shows "Never used" and "has not been installed on any accounts"
• There is no Claude entry under GitHub → Settings → Applications → Authorized OAuth Apps — only under Authorized GitHub Apps
• When reconnecting GitHub on claude.ai, there is no repository selection/install step presented to the user, so it's impossible to grant repository-level access

Root Cause Hypothesis

The claude.ai GitHub connection flow only completes the GitHub App authorization step (identity verification) but does not trigger the installation step (repository access grant). Without installation, the GitHub App cannot verify access to private repositories.

Environment

• Claude Code version: 2.1.132
• Platform: macOS (darwin 25.3.0)
• Repository visibility: Private
• Repository ownership: Personal account (not organization)

Workaround

None found. Making the repository public is not acceptable for work projects.