Mac Outlook 2011 won't open AD distribution list's calendar

Hello,

I am using Outlook 2011.  There is a distribution list in active directory window server which i am the owner of the group (IS-US).  There are 5 members in it.

With Outlook PC, I can just go to calendar, open calendar from address book, and view those 5 members' calendar.

However in Mac Outlook, permission is denied when openning it up from "Open Calendar"

Can anyone help fixing this issue?

Thank you so much.

Regards,

Dipo