We have a 3 night cash, 3 night
DVC stay in May. They are 2 separate booking windows for FP. I called a few times leading up to this, and twice on my first FP booking day and they will not override. I asked each time if it would matter if my cash stay was also a DVC stay and I was told “no” each time. I had to book my FP for days 1-4 at 60 days from first check-in and my FP for days 4-5 at 63 days from my first check-in date. (because you’re able to book checkout day for reservation #1, which is day 4 in my case, with the first booking window).
That said, even booking in two parts like that I was able to get all of the FP I wanted (including SDD on day one and FoP on day 2) without any issue, all had plenty of availability. I’m not sure what experiences others are having with their booking windows.