CMMC Practice IA.1.076: Identify information system users, processes acting on behalf of users, or devices.
CMMC CLARIFICATION (Ref CMMC – Appendix B)
Authentication helps you to know who is using or viewing your system. Make sure to assign individual, unique identifiers, like user names, to all employees/users who access company systems. Confirm the identities of users, processes, or devices before allowing them access to the company’s information system-usually done through passwords.