Using a Microsoft account that is blocked on anything other than what is owned by microsoft will bring you to a screen that says "Your parent has blocked access to games and apps that aren't published by Microsoft. If you want to use this app, ask your parent to visit account.live.com/mk and go to Manage this child's access to third-party apps for your account." despite Microsoft owning Minecraft/Mojang. This will need cooperation from Microsoft to be fixed.