What feature can an Okta Administrator use to change the username format from Firstname.Lastname to Lastname.Firstname?

The option that allows an Okta Administrator to change the username format from Firstname.Lastname to Lastname.Firstname is to override a username format. This feature is designed specifically for altering how usernames are generated and displayed within the Okta environment, enabling administrators to customize the naming convention according to organizational requirements or preferences.

By utilizing the username format override, administrators can ensure that the system adheres to a consistent naming policy that might be more recognizable or suitable for a specific organization. This level of customization is crucial for maintaining clarity and cohesion in user management and directory services.

Other options do not fit this need as effectively. For instance, a custom user type primarily pertains to categorizing users into different types but does not provide a mechanism for altering username structure. Attribute profile sources focus on where user attributes are drawn from and do not directly influence the format of usernames. Lastly, custom user attributes allow administrators to define specific fields for user data but again do not change the format of usernames. Thus, overriding the username format specifically addresses the requirement to reshape how usernames are constructed in the Okta system.