Could not read mailbox information from active directory

I wonder if anyone has experience of working with Enterprise Vault 10 with Exchange 2013 that uses DAG's

When trying to add an new exchange 2013 server target to Enterprise Vault 10.0.4 in Admin console I get the following;

Could not read mailbox information from Active Directory.

Ensure that the target Exchange Server hosts an active mailbox database.

Error: There is no such object on the server.

I have created a mail profile and can use Outlook to open the System Mailbox on Exchange 2013.

I have tried setting the global catalog against the EV site but this didn't work.