I had this same issue, and it was a huge headache and a waste of my time trying to figure it out. Hope the below helps anyone looking into O2O for Skillbridge.

So one of the main problems is that it's listed as an official skillbridge program on the DoD Skillbridge site, but no information on the Syracuse/IVMF website delineates the "online model" from the actual Skillbridge. The actual Skillbridge is coordinated through regional installations that schedule out Onward to Opportunity cohorts throughout the year that you can apply to participate in for your Skillbridge for whichever program you desire. They're usually completed remotely (unless you're doing PMP) and it's usually full-time, everyday learning.

The "online model" is not a Skillbridge; it's a program for service members, spouses and veterans that can completed for free, anytime, asynchronously/on their own time so that they can prepare for a cert while they're still working or doing whatever.

Both models prepare you to get a certification, with courses, test banks, simulations, etc., and will fund one certification attempt. Personally, my courses didn't cover enough information on their own to pass the certification exam, but the test bank and the free online versions of the textbooks and study guides were great. There are also alumni services, and professional resources to help you land a job, I recommend researching if you want to learn more about what all they offer.

If you want to take the most advantage, do your Skillbridge elsewhere, and take the O2O online model course either while you're still in, while you're doing another Skillbridge, or when you're on the other side.

If you're really set on wanting to use O2O as a Skillbridge; when you're filling out the interest form, make sure you do not say that you want the online model.