If you’re playing around with older OSes in the latest versions of Hyper-V, you’re missing one thing, the Integration Components (IC).
With Win10/Server2016 they no longer include this ISO as the current “supported” OSes all get their IC viaWindows Update.
You can get the IC from Hyper-V 2012/2012R2 Server, a free download, here:
https://www.microsoft.com/en-us/evalcenter/evaluate-hyper-v-server-2012-r2 (you’ll need to either find a way to extract it or install Hyper-V Server in a VM to get the vmguest.iso)
Or, if you’ve got a Windows 8/8.1/2012/2012R2 VM/system available with Hyper-V installed you’ll find it in the C:\windows\system32\ folder.
I’ve got a copy from Hyper-V 2012 R2 here: https://1drv.ms/u/s!AnbqFQxI6C6pidtRrLfIRLDSHKeYmw
No guarantees how long MS will allow it will stay up here, though it’s freely distributed with Hyper-V Server.