The main purpose of this legislative text is to amend the Patient Protection and Affordable Care Act (ACA) to prevent individuals from being enrolled multiple times in health insurance exchanges. This aims to streamline the enrollment process and ensure that resources, such as premium tax credits, are not wasted on duplicate enrollments. Key provisions of this amendment include a requirement for the Secretary of Health and Human Services to create a system that checks for duplicate enrollments within 60 days of the law being enacted.