Help on MDE

I’ve been browsing MDE to see how to book dining and FP when the time comes (dining I can book in Feb, FP not until around June.
My holiday booking is already linked to MDE but when I look at FP reservations it says it can’t find our tickets. It states my booking is already linked if I try to link them at this point.
I assume this might be because I’m looking too early and access to the actual bookings isn’t open to me yet - is that why?
I don’t want to get to my FP booking date and find I have to spend time on the phone for hours trying to sort this out, meanwhile all my precious FP are getting booked up!!

Yes it’s because it’s too early