How to use Canon PIXMA GM4070 printer with macOS

The printer is compatible with airprint. As long as it is connected to the same wireless network as your computer, you should simply be able to add it in system settings > printers & scanners. If it’s already there and not working, delete it then add it back.

Just one data point - maybe it will help.

I have a pixma TR150. It worked fine pre-OS 26.1. The only way I could get it to work with OS 26.1 was to (1) connect to printer via IP address (instead of Default), then (2) select Airprint. Otherwise, I get an "invalid certificate" error when printing. I had to do it all again after updating to OS 26.2. Ironically, it has always worked flawlessly from iOS, right up through iOS 26.2.

Here is a link to instructions for getting the IP address:

https://oip.manual.canon/USRMA-0257-zz-SS-enUV/contents/09020023.html