The Grab&Go page only lists locations of the active kitchen that are active and flagged Is a Grab&Go ? (the Is a Pickup Location? switch is not required for a location to appear here). Check those switches on the location. If no location qualifies at all, the page shows the no locations screen. A location that is listed but shows No Dates Available has no Grab&Go Open Days ticked, no upcoming delivery dates on those weekdays within your visible-dates window, or all of them are already closed by its Cut-off Timer. A date that lists no meals means no meal/portion has stock above zero at that location - run Update Stock or a CSV upload on the Retail Menu page, or check Stock Management.