Individual enrolment:
Each user has a unique installer link which is sent via email on enrolment. When a new policy is shared, read and agreed, this is tracked for each user.
Bulk deployment:
Windows: The username from the Active Directory is used to identify users throughout the network.
Mac, iOS, Android: Users will need to agree policies on all their devices, we are working on new functionality to automatically detect the user as they move between devices in these cases.