Can't add existing VM to RDS Collection (Server 2012)

I have a Hyper-v server running Windows server 2012.  This server has the RD Virtualization Host role added (for remoteFX)

I have a VM running Server 2012 with RDS gateway/broker/web access/Licensing.

I can connect to my web interface/gateway and I can see a collection I created, when I try to connect to it, it errors because I don't have any VM's added to my collection (which brings me to my issue)

I created a Personal, unmanaged collection.  I wanted to add an existing Windows 8 RTM VM that I had created previously and assign it to myself.

But when I try to add it (or any other VM on the Hyper-v box) I get an error that I couldn't add the VM, but there is no reason why, no errors in the RDS event logs or system/app event logs.

Ideas?

Thanks