An order is on the app's tablet but never reached us. Where do I look?

Open Settings, then Delivery & dine-in, then Delivery apps. The app's card shows when the last order came in and any error it returned. Orders from the apps lists the recent ones with their state, and What the apps said shows the last thirty messages in and out with failures in red. If nothing at all is listed, the address in the app's portal is usually the cause, or the connection is paused.