Agree with lanejudy. That was my understanding from the beginning, so I didn’t even try to call in yet because some days of our stay are outside of the 30 day window.
I’ve seen at least one post on DIS and another somewhere else where they made the video call for a stay that began within the 2-30 days, but the days at the end of the trip were more than 30 days away.
They WERE able to register for
DAS and it will be valid for their entire trip (DAS is valid for 60 days once registered).
They WERE able to book DAS Advanced Selections ONLY for the days that were 30 days or less away, but not for the farther away days.