[BUG] oauth_org_not_allowed on personal Pro account — subscription access blocked without any changes

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?

Claude Code returns "Your organization has disabled Claude subscription access
for Claude Code" on every request, including a plain "hello". The error code is
oauth_org_not_allowed (403 permission_error). This is a server-side block —
/doctor is fully green and /feedback also returns 403.

What Should Happen?

Claude Code should work normally with my active Claude Pro subscription,
as it did 20 minutes before the error started.

Error Messages/Logs

Error: 403 {"type":"error","error":{"type":"permission_error",
"message":"OAuth authentication is currently not allowed for this organization."}

Steps to Reproduce

1. Log in with claude /login (personal Pro account)
2. Type any message, e.g. "hello"
3. Error appears immediately
4. Re-login via /login shows "Login successful" but error persists
5. claude setup-token does not help — same error after token generation
6. Issue reproduces on multiple devices simultaneously

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.161 (was working, then stopped suddenly without any changes)

Claude Code Version

2.1.161

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

• Email: foreignagent969@gmail.com
• Organization: foreignagent969@gmail.com's Organization
• Plan: Claude Pro (personal, not Team/Enterprise)
• /status shows: Login method = Claude Pro account, correct email, no stray API key
• /doctor shows: OAuth token present, subscriber auth active, org UUID resolved
• Current session limits: 15% used, weekly: 14% used
• Issue appeared suddenly while actively working
• Reproduces on 2 different devices simultaneously
• /feedback returns 403 as well, confirming full server-side block