[BUG] Desktop app authentication fails - "We were unable to verify you with this link" error

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?

Description:
Unable to log in to Claude Code Desktop app on Windows 10. Both Google OAuth and email login flows fail to complete authentication.

Authentication fails with verification error. Browser login works fine for claude.ai.

Environment:

OS: Windows 10
Browser: Firefox
Desktop app version: [check Help → About in the app menu]

Additional context:

Browser-based claude.ai login works normally
Already tried: signing out/in, complete app restart, checking internet connection
No VPN or proxy in use

What Should Happen?

I should be able to log into the desktop app. I cannot. Currently every login flow is a dead end for me.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

Open Claude Code Desktop app
Attempt to log in via Google - browser shows "success" but desktop app doesn't proceed
Attempt to log in via email - click "get login code"
Error appears: "We were unable to verify you with this link"

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

It's claude destop

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

This is for the claude desktop app not Claude Code but I can't find where to log bugs for the desktop app.

<img width="674" height="368" alt="Image" src="https://github.com/user-attachments/assets/a0d0b030-fcec-4419-bf38-92abe2217f2e" />