I have a Visual Studio subscription and am using the available monthly credits for Azure. I noted when trying to create a test Win10 VM that you needed to select "eligible Windows 10 licence with multi-tenant hosting rights" to progress - it wasnt clear to me whether I was or was not allowed to progress, so have not at present.
On looking at forums, this seems permissable under Dev/Test offers , and the credits under Visual Studio seem to be "DevTest" . The credits option seems to indicate that I get "exclusive access to Windows 10 VM images" , however one of the offers pages  indicates that "these monthly Azure credits for Visual Studio Subscribers are unrelated to Enterprise Dev/Test subscriptions" 
After checking my offer ID under costing management and billing (ms-azr-0063p), the offer details  notes "When you set up your monthly Azure credit, you can run Windows 10 images on Azure for dev/test".
As it explicitly notes that I can run Windows 10 images, I am assuming that I do, indeed, have an eligible license with multi-tenant hosting rights, so am therefore ok to check the box when creating a Windows 10 host resource.
Given my 'journey' above, I remain not wholly convinced, however, so I thought I would ask this specific question just in case it helps anybody else... Working through these license details is like working through new questions on tax forms.
Any feedback greatly appreciated!!