ARR Broken or Bad Syntax? Exchange 2013 + Essentials 2012 R2

I am having an issue with AAR. The original setup was Server 2012 R2 + Exchange 2013. I was contracted to move the Exchange 2013 to a VM (Hyper-V) and install Essentials 2012 R2 on another VM (Essentials 2012 R2 not Server 2012 R2 with Essentials Role). Not really anything new and normally this setup works like a dream. The point I am getting stuck is with the ARR not working.

The steps I take are:

1.       Elevated command prompt
2.       Switch to C:\Windows\System32\Essentials\
3.       Type: ARRConfig config –cert "C:\Temp\Exchange.PFX" –hostnames “mail.internaldomain.local,mail,mail.externaldomain.org" -targetserver MAIL.INTERNALDOMAIN.LOCAL
4.       Or type: ARRConfig config –cert “c:\temp\1.pfx” –hostnames “mail.externaldomain.org,mail.internaldomain.local”–targetserver “MAIL”

Both return the following

ARRConfig config -cert -hostnames [,name2,...nameN] [-targetserver]
ARRConfig unconfig
Example:
ARRConfig config -cert “c:\tmp\certificate.pfx” -hostnames “www.contoso.com,mail.contoso.com”
ARRConfig config -cert “c:\tmp\certificate.pfx” -hostnames “www.contoso.com,mail.contoso.com”-targetserver MyExchangeServer

I have tried uninstalling ARR and reinstalling, uninstalling ARR 3.0 and installing ARR 2.5 (both with URL rewrite), re-exporting the exchange certificate.

Not sure where to go from here, as it typically works seamlessly in the past…