Ok, I think you may be using the virbr0 bridge which is not yet enabled to accept incoming connections from an external source.
To fix this, goto the network settings page of the unRAID webgui and enable a bridge and give it a name. Then, with your VM turned off, go to the VMs page of the web GUI and edit your VM. Turn on advanced view and change the network bridge from virbr0 to the bridge you created. This will give your VM an ip from your router. From there, your rdp should work.
How to remote desktop into VM
in VM Engine (KVM)
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Thanks mate! Useful info