workspace_organization_exists
A live business with that name (case- and spacing-insensitive) already exists - on create, or on a rename onto it. existing_organization_id names it when you can open it, and is null when it belongs to a teammate's book. Nothing was created or changed.
Problem shape
Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.
{
"type": "https://docs.vocapable.com/errors/workspace_organization_exists",
"title": "…",
"status": 409,
"detail": "…",
"instance": "/v1/…"
}