[BUG] Magic-link login returns “can’t verify email” error on desktop app and web — distinct from onboarding redirect issues, 1+ month unresolved

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?

Note: This does NOT appear to be the same issue as #60022, #57164, #36797, #39788, or #22685. Those issues describe users being redirected to an onboarding flow. This issue produces a verification failure error after clicking the magic link, with no redirect to onboarding. This appears to be a distinct failure mode of the same auth system.
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Summary
Magic-link email login has been completely broken for 1+ month across both the Claude Desktop app (Windows) and claude.ai in browser. The only working access is via the Claude mobile app. Anthropic support has not provided a human response.
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Environment
OS: Windows 10/11
Desktop App: Claude for Windows (AppData\Roaming\Claude)
Browser: Multiple tested
Account type: Pro
Issue duration: ~1.5 months (began approximately beginning May 2026)
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Behavior
Issue appeared for first time after downloading and attempting to log in to desktop app for first time
Enter email on desktop app or browser login screen
Magic link email is received successfully
Click link — receive error stating identity/email cannot be verified
Side effect: Every failed desktop app login attempt also breaks browser session on the same machine
Clearing browser cache restores browser access temporarily
Clearing AppData\Roaming\Claude entirely (all subfolders and files) does not resolve desktop app issue
Browser access has now also become persistently broken
Mobile app (same account, same email) works without issue
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What I’ve tried
Deleted entire AppData\Roaming\Claude directory
Cleared browser cache and cookies (temporary fix for browser only)
Tried multiple browsers
No VPN or proxy in use
Confirmed magic link is being opened on the same device it was requested from
Uninstalled Claude Desktop app and Claude Code completely
Searched entire C drive and deleted every file and folder referencing “Claude” or “Anthropic”
Rebooted machine after full removal
Issue persists unchanged after all of the above
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Support history
Contacted Fin (support.claude.com) — repeated basic troubleshooting, no escalation
Emailed support@anthropic.com — no human response received
Issue has persisted unresolved for 1+ months with no human response from Anthropic support
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Notes
Per issue #60022, this appears to be a server-side backend identity-mapping failure, not a client-side issue. Standard self-service troubleshooting does not apply. Requesting engineer review and human support escalation.
Not willing to share email address publicly. I will send a message to Anthropic support referencing this issue number after it's created.

What Should Happen?

Login successfully and able to use services I've been paying for

Error Messages/Logs

We were unable to verify you with this link

If the problem persists, please contact support.

Try again

Steps to Reproduce

Enter email on desktop app or browser login screen
Magic link email is received successfully
Click link — receive error stating identity/email cannot be verified

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

n/a

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_