Why can’t I assign a VSO user as having ‘eligible MSDN’ using an AAD work account?
When access VSO you have two authentication options; either a LiveID (or an MSA using it’s newest name) or a Work Account ID (a domain account). The latter is used to provide extra security, so a domain admin can easily control who has access to a whole set of systems. It does assume you have used Azure Active Directory (AAD) that is sync’d with your on premises AD, and that this AAD is used to back your VSO instance....