[BUG] Claude Code Authentication Broken on Android + Codespaces (OAuth Redirect Issue)

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?

I am writing to report a critical issue with Claude Code authentication that makes the product unusable for Android users accessing GitHub Codespaces.
Problem:
Claude Code's OAuth flow redirects to localhost:PORT/callback
Android browsers cannot connect to localhost (ERR_CONNECTION_REFUSED)
claude setup-token also fails with the same localhost redirect
This makes Claude Code completely inaccessible for remote development on Android
Environment:
Device: Android phone
IDE: GitHub Codespaces
Claude subscription: Pro (paid)
Claude Code version: 2.1.168
Expected behavior:
OAuth redirect should work without localhost (e.g., to platform.claude.com/oauth/callback)
Or provide a non-interactive authentication method for headless environments
Or document a workaround for Android users
What I paid for:
I purchased Claude Pro specifically to use Claude Code, but I cannot authenticate it on the only device I'm currently using for development.
Workaround used:
Had to resort to Python scripts to write files instead of using Claude Code's intended features.
This is a significant product limitation that should be documented or fixed.
Best regards,

What Should Happen?

Claude

Error Messages/Logs

I am writing to report a critical issue with Claude Code authentication that makes the product unusable for Android users accessing GitHub Codespaces.
Problem:
Claude Code's OAuth flow redirects to localhost:PORT/callback
Android browsers cannot connect to localhost (ERR_CONNECTION_REFUSED)
claude setup-token also fails with the same localhost redirect
This makes Claude Code completely inaccessible for remote development on Android
Environment:
Device: Android phone
IDE: GitHub Codespaces
Claude subscription: Pro (paid)
Claude Code version: 2.1.168
Expected behavior:
OAuth redirect should work without localhost (e.g., to platform.claude.com/oauth/callback)
Or provide a non-interactive authentication method for headless environments
Or document a workaround for Android users
What I paid for:
I purchased Claude Pro specifically to use Claude Code, but I cannot authenticate it on the only device I'm currently using for development.
Workaround used:
Had to resort to Python scripts to write files instead of using Claude Code's intended features.
This is a significant product limitation that should be documented or fixed.
Best regards,

Steps to Reproduce

I am writing to report a critical issue with Claude Code authentication that makes the product unusable for Android users accessing GitHub Codespaces.
Problem:
Claude Code's OAuth flow redirects to localhost:PORT/callback
Android browsers cannot connect to localhost (ERR_CONNECTION_REFUSED)
claude setup-token also fails with the same localhost redirect
This makes Claude Code completely inaccessible for remote development on Android
Environment:
Device: Android phone
IDE: GitHub Codespaces
Claude subscription: Pro (paid)
Claude Code version: 2.1.168
Expected behavior:
OAuth redirect should work without localhost (e.g., to platform.claude.com/oauth/callback)
Or provide a non-interactive authentication method for headless environments
Or document a workaround for Android users
What I paid for:
I purchased Claude Pro specifically to use Claude Code, but I cannot authenticate it on the only device I'm currently using for development.
Workaround used:
Had to resort to Python scripts to write files instead of using Claude Code's intended features.
This is a significant product limitation that should be documented or fixed.
Best regards,

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_