I don't think the MDE system was designed with
DVC in mind. I have had the hardest time linking my family of 4 (one MDE acct) with my sister's family of 3 (another MDE acct) since we are all staying together in a 2 bedroom villa at GFV next month.
We have done the friend invites - didn't work. I have spent multiple hours on the phone with member services - just made things worse. They finally had to get Disney IT involved when my mother, her ticket and all of her FP+ reservations just vanished.
Everytime I spoke with someone at member services, they questioned why I needed all of the people on the 2 bedroom villa reservation linked together? They wanted me to just keep the 2 MDE accounts separate. It's like no one ever thought that larger DVC villas would hold multiple families who each had their own MDE accounts. Everyone has to be linked up to reserve FP+ reservations at the same time, and to be able to change them all at one time, by one person.
The system is just a mess. I dread to see all of the problems we are going to have on our trip next month. Although my mother, her ticket and FP+ reservations are back in MDE, I can tell it isn't right