I've tried restarting everything, updating drivers, and checking network connections – the Canon printer still shows a Google Cloud Print communication error. What's next?

If those steps haven't worked, consider a hardware issue with the printer. Contact Canon support for assistance. You might need to diagnose if the printer's network card is faulty. Alternatively, there could be an issue with your router or network hardware. Testing the printer with a different computer on the same network can help isolate the problem.