Okay, just have to update here.
I started this thread a year ago when online check-in was new and I couldn’t get it to work. Turns out that because we booked through a travel agent, I couldn’t check in online.
However, this year we booked online ourselves and I was thrilled to be able to use the online check-in service! I checked-in last night, it worked great, now hopefully all will go smoothly when we get there! Can’t wait!!