[BUG] Cowork returns 403 "Request not allowed" on Pro plan subscribed via iOS App Store

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?

Cowork feature fails with 403 authentication error every time a task is submitted. Code mode works fine on the same account.

Error message:
Failed to authenticate. API Error: 403 {"error":{"type":"forbidden","message":"Request not allowed"}}

Plan: Claude Pro (subscribed via iOS App Store)
OS: Windows 11
Claude Desktop: latest version

Steps to reproduce:

1. Log in with Pro account (iOS App Store subscription) on Claude Desktop
2. Open Cowork → submit any task → 403 error immediately
3. Code mode works normally on the same account

Expected: Cowork should work for Pro plan subscribers regardless of subscription method.

What Should Happen?

Cowork should authenticate successfully and process tasks, just like Code mode does on the same account. Pro plan subscribers (regardless of whether they subscribed via iOS App Store or Anthropic's website) should have full access to Cowork.

Error Messages/Logs

Failed to authenticate. API Error: 403 {"error":{"type":"forbidden","message":"Request not allowed"}}

Steps to Reproduce

1. Subscribe to Claude Pro via iOS App Store
2. Log in to Claude Desktop on Windows 11
3. Switch to Cowork tab
4. Submit any task
5. Immediately receive 403 error

Note: Code mode works fine on the same account. Only Cowork fails.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.1617.0 (8d6345) - Claude for Windows

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Subscription method: iOS App Store (not direct Anthropic website subscription)
Code mode works fine on the same account. Only Cowork fails with 403.