The fax was cancelled.

Bad Request Fax ID must be a valid uuid.

No usable API key: none sent, a key that doesn't exist or was revoked (a revoked key stops working within a minute), or two kinds of credentials at once.

Unauthorized Access You are not authorized to cancel this fax: the key is Scoped.

Not Found Fax not found: no fax with this id is on your account (a fax of another account included).

• Unprocessable Fax cannot be cancelled. Current status: delivered. Only faxes with status: queued, media.processed, sending can be cancelled. (with the fax's status).
• Unprocessable Fax cannot be cancelled at this time. It may have already been sent or is in a non-cancellable state.
• Unprocessable Fax cannot be cancelled: it finished while the cancel was in progress.

• Server Error Unable to fetch fax log.
• Server Error Failed to cancel fax at provider: the fax could not be stopped.
• Server Error Failed to update fax status.
• Server Error An unexpected error occurred.

Your key could not be checked just now; the key may be fine. Wait Retry-After seconds and retry.