[BUG] Th405 error message when trying to re-authenticate Gmail via Claude Code That it happens immediately on clicking the link (before any sign-in)

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?

That you're getting a 405 on https://api.anthropic.com/authorize when trying to re-authenticate Gmail via Claude Code
That it happens immediately on clicking the link (before any sign-in)

What Should Happen?

For Claude code to log into my Gmail

Error Messages/Logs

That you're getting a 405 on https://api.anthropic.com/authorize when trying to re-authenticate Gmail via Claude Code
That it happens immediately on clicking the link (before any sign-in)

Steps to Reproduce

That you're getting a 405 on https://api.anthropic.com/authorize when trying to re-authenticate Gmail via Claude Code
That it happens immediately on clicking the link (before any sign-in)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code v2.1.126

Platform

Anthropic API

Operating System

Other

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_