https://arstechnica.com/gadgets/2018/08/microsoft-prepares-to-kill-the-windows-8-store-no-new-apps-from-november/

Windows 8.1 dropped out of mainstream support earlier this year, entering the five-year extended support period in which it receives only security fixes. However, Microsoft is still accepting new application submissions to the Windows 8 Store. Submissions for new Windows Phone 8 apps are also currently accepted.

Today, Microsoft announced that this is soon coming to an end. After October 31, new applications will no longer be accepted for distribution through the store.