The foil has not been removed from the connector of the detergent cartridge.
Remove all of the foil from the connector before inserting the detergent cartridge into the washing machine.
The detergent cartridge is difficult to insert and secure in the TwinDos system compartment for the washing machine/washer-dryer.
Remove all of the foil from the connector before inserting the detergent cartridge into the washing machine.