Can not enable Domino Mailbox in Enterprise Vault

Hello,

I had complete to set up Domino Server Archiving.  When I expanded \Enterprise Vault\Server\Targets\Domino\(show our server name).

But I try to select Archives\ Domino Mailbox and click the enable mailbox button to select the server, it display "No mailboxes found".  I can ping our server IP.

Could anyone tell me why I can not enable the Domino Mailbox?

Enterprise Vault version: 10.0.2

Domino Server version: 8.5.3

Best Regards