> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sequenzy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Cancel a Subscriber Operation

> Stop future work while retaining completed changes

Stop future work while retaining completed changes. See [background contact tasks](../../concepts/subscribers#background-tagging) for selection, retry and cancellation behavior.

Requires subscribers:read. Tagging and cancelling a tagging task also require subscribers:tag; creating tag definitions requires tags:write; triggering automations requires automations:trigger. Personal keys retain current company role restrictions. Company keys retain company-scoped authority. Workers recheck authority on every page.

Cancellation returns `200` with the terminal operation. Applied tags remain. A contact being updated when cancellation wins is recorded in `failures` with an uncertain outcome; check it before starting another task. Repeating cancellation returns the same terminal state. A busy cancellation race returns `409` and can be retried.

Missing authentication returns `401`; missing scopes or company access return `403`. An operation outside the selected company is reported as `404`, as is an operation whose retained record no longer exists.