[BUG] All CLI authentication methods fail with a "temporary service disruption" page, while Claude Desktop works fine on the same machine.

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?

1. I run claude login (or claude setup-token) in terminal
2. Browser opens and immediately shows:

"Claude will return soon — Claude is currently experiencing a temporary service disruption."

Error code: 08XN6TZ.1022592012

What I've tried:

Different networks (corporate, home, mobile hotspot)
Incognito browser window
Both claude login and claude setup-token
Anthropic status page shows all systems operational

Environment

Claude Code version: 2.1.139
OS: macOS 25.4.0
Claude Desktop works fine and is logged in on the same machine

What Should Happen?

CLI auth completes successfully like Desktop auth does.

Error Messages/Logs

Steps to Reproduce

It's probably only reproduce-able on my end (specific issue with auth for my account)

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.139

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_