Documents are printed in monochrome
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Check 1 Is Color Mode set to Monochrome, or Print Target set to Monochrome (Photo) in a Windows printer driver?
In the Advanced Settings of the printer driver, specify Color in Color Mode and try printing again.
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Check 2 Is Black and White Photo Print selected in a macOS printer driver?
Deselect Black and White Photo Print in the printer driver Quality & Media settings, and then print again.
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Check 3 The print head nozzle may be blocked
Print a test pattern to check the color ink nozzles and see if they are clogged.