The Patient Protection and Affordable Care Act is entering atough new phase.

Those implementing the landmark health law are trying to figureout how to fix some of it’s flaws that have caused millions to bedenied insurance that they’re entitled to or to bekicked off or drop plans because of the high costs.

In addition, there remain millions who, despite the insurancemandate, have not signed up for Medicaid or purchased insurancethrough the Obamacare marketplaces. To fulfill the promise of thelaw, federal officials need to figure out how to get this segmentof the population insured.

The group is largely made up of young people living barely abovethe poverty line, Health Secretary Sylvia Burwell told NPR. Whilethere are a variety of reasons that millions are still resistingthe mandate, officials are convinced that more intense outreach toeducate the uninsured on health care opportunities iskey.

But it’s clear that the remaining group of uninsured will beharder to convince than the millions who have enrolled during thefirst two years of the PPACA.

NPR reports that the Department of Health and Human Services isconfronting the communications gap by trying to talk to youngpeople where they hang out: online. The administration is usingFacebook, paid online advertisements, emails and texts to reach themost stubborn Obamacare resisters.

The new incarnation of healthcare.gov is supposed to offer thoseseeking plans a new set of tools to better evaluate their insuranceoptions, based on their location and the services and medicinesthey depend on. But there are big fears that reported glitches in the site might notbe ready by the time open enrollment starts on Sunday.

In the midst of uncertainty from the federal government, anumber of private organizations are stepping up to get peopleinsured. Enroll America, a nonprofit devoted to getting peoplesigned up for the PPACA, is launching a new app that allows peopleto compare plan offerings and costs.

Not that the group is opposed to old-school tactics. “Perhapswe'll go to church on Sunday, and we'll actually stand up in frontof the congregation and share with them the information,” AnneFilipic, the group president, told NPR.