Why is my Canon CP1000 not working with macOS Sonoma?

The latest printer driver for the Canon SELPHY CP1000 appears to be for macOS 10.13 High Sierra. One should perhaps not rule out that this driver could work with a few following operating system versions as well, but it may not be compatible with the much newer macOS Sonoma 14. You may want to contact Canon about this.

https://www.canon-europe.com/support/consumer/products/printers/selphy/cp-series/selphy-cp1000.html?type=drivers&language=EN&os=macOS%2010.13%20(High%20Sierra)

https://www.cla.canon.com/cla/en/support/consumer/printers_multifunction/compact_printers/selphy_cp1000#driversAndSoftwareTab

A few image formats could possibly be printed directly from a memory card or a USB flash drive (details in the printer user guide).

Add a printer to your printer list so you can use it on Mac – Apple Support (UK)

Reset the printing system on your Mac to solve a problem – Apple Support (UK)