Canon Pixma mx 439 does not work with macOS you need to verify the SSID ( Network Name), your Canon printer and computer both should connect same wifi network, you need reinstall the driver.
Before connecting printer to the network, the computer needs to be connected to the network.
If your problem is not fix, you can reinstall the driver of Canon mx439 printer. Other thing you can check ink cartridge in the Canon printer. If it is not work then you need to call customer service.
Canon PIXMA MX 439 Does not Work with macOS?
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