WVD Windows Server licensing

AlexPawlak Correct, OS licensing costs do not apply to WVD session hosts. Most likely part of Microsoft's strategy to promote as-is RDS(H) migrations, when (re)building a Windows 10 Multi-session image is not appropriate. Although I would expect Windows_Server as license type, the end result should be the same (automated auding might one day deem it as strange though, I suppose). 

"You need an Azure account and subscription to quickly deploy and manage your virtualization environment. These are the Azure components that factor into the price of a Windows Virtual Desktop deployment.

• Virtual machines and operating system (OS) storage
• Data disk (personal desktop only)
• User profile storage
• Networking"

https://azure.microsoft.com/en-us/pricing/details/virtual-desktop/