Minecraft on Chromebook arrange query

So that is my first time taking part in Minecraft. I noticed that the beta was out there on my Chromebook, downloaded and tried to sign up. I do have a Microsoft account for Skype so it let me log in, however then I used to be met with this screenasking for a second e mail, however after I kind my main e mail, it offers me this message. My query is, do I HAVE to enroll with a Microsoft proprietary e mail account to proceed to play? Hoped to make use of my predominant/e mail I signed up with the Microsoft ID with