Here is the reply that I got back from the Polynesian IPO:
Aloha!
Thank you for your email!
If you need assistance with booking FastPass+ selections at your 60 day mark, please give us a call at the number below between 9am and 6pm.
Have a magical day!
Mahalo,
I take to mean that I shouldn't email my selections to them beforehand, but if I'm such a dope as to need "help" on my 60 day mark, give them a call.
I've been staying club level at the Polynesian for many years, so IPO isn't new to me; just whether or not they've been making the FP+ selections or not. Back in the day, I used to LOVE to get up early and make my own ADRs (back then they were Priority Seatings), even though I knew IPO would/could do them for me.
But now my health problems have gotten worse, and some days I'm not able to be up early and/or thinking clearly on any given day, so having IPO handle these things for me is a great resource.
When my 60 day mark rolls around, I'll decide whether to call them with my list, or do it myself. At least I already have a "My Disney Experience" account all set up with my resort and park tickets already linked.