Which Active Directory feature allows Cisco ISE to modify the username for an incoming request and send it to Active Directory in the required format?

The feature that allows Cisco Identity Services Engine (ISE) to modify the username for an incoming request and send it to Active Directory in the required format is known as Identity Rewrite.

Identity Rewrite is particularly useful when dealing with various naming conventions or formats that may be used within an organization. For instance, when user credentials are submitted, an organization might require the username to be in a specific format (like domain\username or user@domain.com) that differs from what is initially sent by the client. By utilizing Identity Rewrite, Cisco ISE can dynamically adjust the format of the username as needed before sending the authentication request to Active Directory. This capability ensures that the authentication process proceeds smoothly without requiring additional user intervention or modifications to client-side configurations.

Other options such as Multijoin Active Directory pertain more to the functionality and management of multiple Active Directory domains rather than modifying usernames. AD Diagnostics focuses on tools for checking the health and performance of Active Directory. NTP, or Network Time Protocol, is unrelated to user authentication or identity management but is instead concerned with synchronizing time across network devices.