How to connect an existing Managed Active Directory to QuickSight when creating?

Hi, I want to set up QuickSight with Active Directory. I've already built a Managed Active Directory and started to set up QuickSight. After chose Enterprise and "Use Active Directory" ub Create your QuickSight account page, I couldn't get the list of directories. It shows No directories available. Push "Refresh list" button many times but no effect. See this page: https://docs.aws.amazon.com/ja_jp/quicksight/latest/user/aws-directory-service.html , and created AD connector additionally but the situation is the same.

How to connect an existing AD with QuickSight when, only when I think, creating a QuickSight account?

Thanks,