I have this problem from our trip in Jan.
Yesterday waited 2 hours and 44 min (called (407) 939-4357 the phone number on the link your
MDE to memory maker page)
Finally got to talk to a person -- passed me over to Memory maker person -- she needed another person to link my account with the Memory Maker and "they are all in a meeting" - not sure if I believe that but she promised that she'd log my request and they'd take care of it when they get out of their meeting. We shall see. All in all my phone was in use for over 3 hours.
While I was at it I complained that I've sent 5 emails - the first on Feb 7 - over 3 weeks ago.
So far today it still isn't linked. I wish I'd realized it before we came home. I think in person would have been better.