When we made our FP reservations last Tuesday (15th) the website just kept spinning and spinning. We started trying right at 7AM EST but couldn't get through at all. I went right to the
MDE app on my phone and made them all there in about 20 minutes for our whole stay. When I finished doing it on my phone, I tried clicking on FP on the website and it still kept spinning.
I was able to load our itinerary easily and it reflected our FP, but I still couldn't login to change FP on the website.
I guess my point is, be ready with the app in case the website seems overloaded.