Crossref has two separate systems which interact with ORCID:
Crossref Metadata Search: The ORCID Search & Link wizard (no auto-updates)
Crossref: An auto-update system activated by invitation from your ORCID inbox
The Crossref auto-update process is granted from a message within your ORCID Inbox (Crossref is currently the only system which uses the ORCID Inbox to send auto-update requests). The request is sent to your ORCID Inbox after a publisher submits a new work to Crossref, with your ORCID iD embedded in the metadata. If you choose to grant long-lasting permissions, Crossref will then update your record automatically whenever a new work associated with your ORCID iD is found in their system - from any publisher. If you do not want to grant permission to update your record with the new work, archive the notification from Crossref.