Adblue pumps have a magnetic switch in the nozzle activated by a radial magnet in the neck of the tank on the vehicle, the pump will not work without this magnet around the nozzle. If anybody has managed to fill a container then the switch on the nozzle has been de-activated.This is supposedly to prevent contamination of the adblue or putting adblue in the diesel.
Google adblue magnets and you can find suppliers, mine cost around £30.