A vendor company represents the business; a vendor investigator represents the individual who performs the work.
Open the investigator profile and confirm the company link. The vendor company detail can show Overview, Vendor Investigators, Cases, Price List, Notes, and History. The individual has staff-profile controls and may have a linked user account.
A company record alone does not create a login for its investigators. Creating an active investigator profile with access enabled can initiate an invitation. Applicant conversion also supports a vendor route; use it when the person's application already exists.