Pro subscriber cannot complete web sign-in on any browser or device — email login link never authenticates the browser; active mobile app session confirms account exists

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?

• I searched existing issues and did not find this one.
• This is a single bug report.
• I am unable to reach human support: the Fin bot at support.claude.com and the in-app "Get help" messenger both decline to escalate or create a ticket, including via the "I can't login" intake path and after explicitly requesting "Wait for the team." There is no email address that reaches a person. This issue is the only remaining channel.

• Plan: Claude Pro (active, paid)
• Account email: bn2k6rx945@privaterelay.appleid.com
• Device: iPhone 17 pro max, iOS 27
• I can verify ownership via my active Claude mobile app session.

I can sign in and use Claude normally in the iOS mobile app. I cannot sign in to claude.ai in any web browser, on any device or network. When I enter my account email on the web login screen, the flow does not authenticate my browser — instead it proceeds as though the address has no account attached and offers to create a new one.

The email address is correct and confirmed: it is the address I created the account with, and the address my Pro subscription receipts are sent to. It is the same address my working mobile session is authenticated under.

I never receive a verification code — only a sign-in link. On iOS, tapping that link is captured by the Claude app via Universal Links, so the requesting browser never completes authentication.

1. Open claude.ai in a browser and enter the account email.
2. Request the sign-in email.
3. Open the email and click or paste the sign-in link.
4. Result: browser is not authenticated. offers to create a new account

The browser that requested the link is authenticated, or a verification code is issued that can be entered on that browser.

• Wrong email address — confirmed against subscription receipts and the working mobile session.
• Browser state — tried multiple browsers, multiple incognito/private windows, cleared cache and cookies.
• Device-specific issue — tried multiple devices, including a public library desktop computer.
• Network-specific issue — tried multiple networks, including the library's.
• Universal Link interception — attempted to copy the raw URL and paste it into the address bar rather than tapping it; also attempted opening webmail in the same browser that requested the link.
• Desktop mode — enabled Request Desktop Website for all sites in Safari settings.
• Cross-device code flow — aware that requesting on one device and clicking on another produces a code for the original device; no code is ever issued.

I am a paying Pro subscriber with no web access to the product. My only access is a persisted mobile app session. If that session ever expires or is invalidated, I will be locked out of a paid account entirely, with no support channel available to recover it.

Please have someone check the authentication and email-delivery state for my account address, and confirm whether the address is in an inconsistent state on the web login path.

What Should Happen?

Be able to utilize browser sign on

Error Messages/Logs

Steps to Reproduce

1. Open claude.ai in a browser and enter the account email.
2. Request the sign-in email.
3. Open the email and click or paste the sign-in link.
4. Result: browser is not authenticated. offers to create a new account

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/a

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_