I have been concerned about this issue for weeks, after reading many horror stories on these boards. I had no problem linking my Swan reservation when I first made it months ago. And it has consistently appeared on
MDE. Until today. Our trip begins on Friday. I checked in to the hotel today on the Marriott App, after having received a message from the hotel to do so. Right after I checked in, the reservation disappeared from MDE. (Coincidence? I have no idea.)
I just added it back in, and MDE recognized it right away. I'm hoping that that solved the problem. I will be vigilant about checking repeatedly to make sure that the reservation is still there, including checking again before 7 a.m. on Saturday (my first park day). But I still don't know whether that will guarantee my ability to book ILL$ rides.