I remember someone recently having an issue with linking one of the DS resorts that should have the 60 day window for fastpasses. I think it was specifically the B Resort, because I had seen something about that one having issues.
I cannot for the life of me find the thread. But I have seen that apparently all issues have now been resolved and all the DS hotels included in the deal can now be linked.
So if this affects you, I hope you can get this resolved now. If anyone can remember who it was, please tag them so they can try.