MIM 2016 - Users / Groups not importing

Hi all, desperate for some assistance here.

I have followed this chapter for importing User and Groups to MIM Portal from our own AD:

https://technet.microsoft.com/en-us/library/jj150428(v=ws.10).aspx#move_ou

But when I come to verify that the import was successful, there are no users or groups whatsoever when I go into the portal (No Items).

I am installing MIM 2016 fresh install on one server in a new domain. I am trying to import users from separate OU's in active directory, is there anything I could be missing here?

Example AD where users are located:

CONTOSO.COM --> (OU) Company 1 --> (OU) Admin Team --> (OU) Users

Do I need to explicitly specify where the users are for the AD Inbound Sync Rule, similarly to that shown in point 16. of theCreate the Group Synchronization Rule in TechNet article above?

Hope someone can shed some light on this for me?

Thanks

Steve