Microsoft have tried this kind of thing more than once in the past, usually ultimately cancelling the projects. There was Microsoft Popfly (retired), Project Spark (retired), Microsoft Kodu (still going), now MakeCode. I suspect there are even more if you go further back.

Our startup has been doing the visual programming thing successfully for around 6 years now, and our latest tool is at www.construct.net. Maybe they should give us a call since it looks like they're struggling to get this right ;)