Checklist items on the Calendar

[Elsa Chung]

Trello Support Page for Advanced Checklist: There is a Trello support page says that I "can view all of my checklist items that have dates assigned to them via the board's Calendar" (How to use advanced checklists to set due dates | Trello | Atlassian Support):

What I have done: I have set up a checklist called "Milestones" with due dates and assignment:

My board's calendar view: But when I look at the calendar view, I cannot see my checklist due dates and assignment in November:

My filter view: I do not have any filters. All of my boards are selected:

My Question: I don't know if it helps to know, but I'm on Trello Enterprise. What am I missing to show the checklists items on the calendar view? 

[Elsa Chung]

I've searched around Trello questions, but none of them seemed to resolve this one.