For any KD issues with orders not showing up, please make sure you are using v2.0.7. Any version before that will not show orders if your menu items are not assigned to a category.
v2.0.7 will show orders even if the menu items do not have a category assigned to them. It is a “catch-all” and not relying on the menu item configuration before selecting the order for display.
My testing was on a ubuntu 20.04 installation on Windows WSL and everything works except emailing using my Office 365 subscription.