Claude Code + Claude Web return 500 errors for single user in org (“No organization or project”)

Summary

I’m consistently getting 500 Internal Server Error responses from both Claude Code (CLI) and Claude Web, but only for my user account. Other users in the same organization work normally.

This appears to be a backend account/org attachment or entitlement issue. The Claude web UI briefly shows a toast saying “No organization or project”, which seems to be the root cause.

Affected surfaces
• Claude Code (CLI)
• Claude Web (claude.ai)

Environment
• Claude Code version: 2.1.38
• OS: macOS
• Org: Team/org account (coworkers unaffected)
• Network: VPN disabled (Tailscale off), also reproduced without VPN

Errors observed

Claude Code (CLI):

API Error: 500 {
  "type":"error",
  "error":{"type":"api_error","message":"Internal server error"},
  "request_id":"req_011CY11cshYFr4w7dPSdAWN4"
}

Claude Web:
• Page displays: “Claude will return soon”
• Error code shown: 15XWQCU
• When navigating to Chat, a toast briefly appears saying:
_“No organization or project”_

Steps to reproduce

1. Log in to Claude Web
2. Navigate to Chat
3. UI briefly shows “No organization or project”
4. Page fails with “Claude will return soon”

OR

1. Run Claude Code in any directory (including empty folders)
2. Any prompt results in 500 internal server error

What I’ve tried
• Logging out and back in (web + CLI)
• Restarting terminal
• Checking for and installing latest Claude Code version
• Re-authenticating Claude Code
• Incognito/private browser session
• Disabling VPN (Tailscale)
• Trying different folders / repos
• Claude status page shows no incident
• Other users in the org work normally

None of the above resolved the issue.

Expected behavior

Claude Web and Claude Code should function normally for a user who is a valid member of an organization, consistent with other users in the same org.

Actual behavior

All requests fail with 500 errors. UI indicates the account is not associated with any organization or project.

Additional context

I’ve already contacted Anthropic support and followed their suggested steps (logout, restart, update, re-auth), but the issue persists. This feels like a corrupted or missing org/project attachment for a single user account.