Esta é a resposta da Canon:
Thank you for contacting Canon product support. We value you as a Canon customer and appreciate the opportunity to assist you. I am sorry that your PIXMA MP560 is not recognizing the CLI-221 and PGI-220 ink tanks you purchased.
The reason that the printer is not recognizing these ink tanks is because these were purchased here in the United States and your PIXMA MP560 was from the United Kingdom. The ink must be purchased from the Canon division where you purchased the printer. Unfortunately, this means that the ink from the United States would not work in your UK PIXMA MP560. It would need to come from a United Kingdom dealer.
I am sorry for any inconvenience this causes. Please let us know if we can be of further assistance with your PIXMA MP560.
TLDR A região da Canon bloqueia os cartuchos de impressão.
Atualização: É possível alterar a região dos cartuchos, usando um dispositivo "redsetter", que também redefine os níveis de tinta (como gravados eletronicamente).