An HRIS provider is not considered an access integration in Vanta, so it will show up as an "unmonitored account" in Vanta. HRIS provider is considered a "people" integration in Vanta, meaning we pull in people users, and not access users. Access users are defined as users who have access as admin/editor to that integration.
The example below show the difference between an "access" integration and a "people" integrations.
Monitored account in Vanta will show an "access" tag on the integrations page, such as data dog:
While you'll see Personio does not have this access tag:
You can remove unmonitored account from your offboarding task set: Edit Unmonitored Accounts Offboarding List