Organizational Stores are your friend

Keep the Dev Center default for Organizational licensing to distribute your app to additional audiences – with no additional work required on your part

By default (see screenshot below) in addition to the Microsoft Consumer Store, your app will be available in the Microsoft Store for Business and the Microsoft Store for Education – providing additional markets and visibility for your apps.

Dev Center Store Defaults

Note that trials and in-app purchases are not supported for apps purchased through these stores. See this blog post for suggestions: Microsoft Store for Education: App Trials and Add-Ons