You can't import a virtual machine created on Windows 2008 R2 into a server running Windows 2012 R2. There's some aspect that's incompatible.
Here's what worked best for me:
Stop the old VM on the Win 2008 R2 machine
Copy the VHD file to the Win 2012 R2 machine
Create a new virtual machine and tell it to connect to an existing virtual disk
Choose the VHD you moved
If you get error 0×80070569 like I did when you try to complete the new VM wizard, restart the Hyper-V Virtual Machine Management per this page: