Hyper-V: Ubuntu 15.04 Server VM not reporting an IP Address, but has network access

I'm running Hyper-V on a Windows Server 2012 R2 machine.  On this machine, I'm running an Ubuntu 15.04 x64 guest VM (as a Gen 1 machine).

I can install the machine, remote in to (it via the Hyper-V manager or PuTTy [SSH]), access the internet with it, etc., but itwill not show me the IP address it has received in the Hyper-V Manager.

I am at a complete loss here.  What am I missing?  My understanding is that Ubuntu Server 14.04+ already have all of the required modules and drivers required to report this information back to the Hyper-V manager.