Use a DEM Account...
That would work as well...In a search, I just found someone else asking a similar question on Microsoft Answers and the answer they was given was just to apply the Intune license to the device account the Surface Hub signs into Skype with.
Surface Hub managed by Intune & Licensing via EMS - Microsoft Tech Community - 120206
Is there any reason not to do it they way suggested on the Microsoft Answers site instead of using DEM?