MAXIFY MB2720 Cannot change an ink cartridge

[TeePeeCan]

Maxify MB2720.

My magenta ink is empty, but the ink level touch screen shows a "?" above the ink level icon.  When I open the door, the cartridges move to the right and I cannot change one.

How do I change it?

thanks

[smittman2]

I had a similar experience with my printer, suddenly got the ? and error message about the black cartridge.  I diddled with it for several days and finally just kept running the head cleaning on the black enough times it finally gave me the X and I was able to change it out.