All routes to claude.ai redirect to onboarding [BUG]

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?

Attempting to log on to [existing, Pro] claude.ai account redirects to /onboarding page. This is consistently happening in the last week, through browser, or CLI, or using linux desktop app. I am then redirected to "Let's create your account", with yet more checkboxes to agree to the Consumer Terms and Acceptable Use Policy, and a "Create account" button.

What Should Happen?

I should be able to log on to the website or app, see my account, and use Claude.

Error Messages/Logs

Steps to Reproduce

1. Attempt to log on through any browser or app, whether or not I am using a VPN.
2. Nothing more. Incorrect redirection is automatic at that point.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Unknown

Claude Code Version

2.1.263 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_