Which ITIL practice supports onboarding actions involving user requests?

The correct choice, which is the service desk, aligns closely with the function of facilitating onboarding processes for users, particularly concerning their requests. The service desk acts as a primary point of contact between service providers and users, managing various interactions related to service requests, incidents, and inquiries.

In the context of onboarding, the service desk handles user requests for access, accounts, and other essential resources or services. It ensures that users have the necessary tools and information to get started effectively. It may also involve coordinating with other practices, but the service desk plays a vital role in the immediate support and resolution of user needs during onboarding.

The other options represent valuable practices but do not specifically focus on user request onboarding:

Change enablement primarily deals with managing changes to services and infrastructure, ensuring minimal disruption during changes.

Project management focuses on the organization and execution of projects, which may include aspects of onboarding but typically does not engage directly with user requests in the day-to-day operational sense.

Knowledge management is aimed at collecting, analyzing, and sharing insights, which supports the service desk but does not actively manage user requests or onboarding processes directly.

Thus, the service desk is best positioned to address user requests during onboarding, providing timely and effective support.