[BUG] Web/desktop login redirects to onboarding page instead of existing paid account

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
Logging in on web and desktop resolves to the "Let's create your
account" onboarding page instead of my existing paid Pro account.
The email is verified successfully during login, but the session
does not map to the existing account.

Steps to reproduce

1. Get logged out of an active session
2. Sign in with a different email address (in my case, a Google

Workspace address on a company domain)

1. Sign out, then sign in again with the original account email
2. Result: redirected to /onboarding instead of the account

Tried without success

• Continue with Google
• Email magic link
• Clean Chrome Incognito session
• Direct URL /new → redirects to /onboarding?returnTo=%2Fnew
• No "Sign in with Google" entry exists in Google linked apps to revoke

Expected
Login resolves to the existing account.

Actual
Login resolves to the onboarding/account-creation page.

Environment

• macOS, Chrome (also reproduced in Incognito)
• Mobile app remains authenticated with full Pro access, confirming

the account and subscription are intact

• Web and desktop only

Support ticket has been open since Sep 1 with no response yet.
Account details and conversation ID available privately on request.

What Should Happen?

Expected
Login resolves to the existing account.

Error Messages/Logs

I see onboarding page

Steps to Reproduce

1. Be logged into an existing paid Pro account on web (Chrome, macOS)
2. Get logged out of the active session
3. Sign in with a different email address on a Google Workspace

domain, then sign out

1. Sign in again with the original personal account email
2. Complete verification (either "Continue with Google" or the

email magic link — both behave the same)

1. Observe: instead of loading the account, the browser lands on

claude.ai/onboarding showing "Let's create your account" with
"Email verified as <original email>" at the bottom

Also reproduces in a clean Chrome Incognito session with no cookies
or extensions.

Navigating directly to claude.ai/new redirects to
claude.ai/onboarding?returnTo=%2Fnew

Note: the mobile app remains authenticated with full Pro access
throughout, so the account and subscription are intact — the
failure is in web/desktop auth mapping only.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A — this issue is not related to Claude Code CLI. It affects claude.ai web and desktop authentication. Filed here because similar auth-mapping issues (#51002, #5N/A — this issue is not related to Claude Code CLI. It affects claude.ai web and desktop authentication. Filed here because similar auth-mapping issues (#51002, #57164, #75638) were reported and accepted in this repository.7164, #75638) were reported and accepted in this repository.

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_