Does your husband have his own
MDE? If so, see if they show up when you are logged in as him. If they don’t, they are still probably linked to his account and MDE is just being flaky. I don’t think you will be able to do anything to link the MBs because they are likely already linked. Making FPs shouldn’t be a problem as long as your tickets are in MDE (and hotel if that applies).
We use old bands all the time and they just seem to work (even when they don’t show up in MDE). That is a terrible explanation, of course, because it doesn’t help when you want to fix it. You could try calling to see if they are linked correctly before your trip. Hope one of these things works! And sorry you are caught in MDE frustration!