Enable auto nurture

Turn Auto Nurture on for up to 100 contacts. Contacts the agent has no nurture seat left for stay off, so read auto_nurture.enabled on each contact rather than assuming it took. Refused only when the agent has no MLS access. contacts holds the ones this call acted on; a contact already on, or not one of the agent's live contacts, is left out and nothing about it changes.

Requires the contacts:write scope. Rate budget: 120 calls per 1 minute per credential (the write class).