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How old is your printer? if less than a year old, and if it is not finding *any* WiFi stations or SSIDs, then it might have become defective within warranty. In which case, contacting Canon in the nation you bought it in or bought it from, would be appropriate, and Canon would fix it for you for free.
But, have you tried checking on the WiFi router box? make sure it is producing a WiFi signal, as well as that it is switched On. (Check as to WiFi network status, on the indicator lights. Restart it if you like, after leaving it Off for 5 or more minutes.)
Or do you mean, that your computer cannot find and print to the printer? if so, was it set up with a fixed IP Address (or 'static IP Address' - both meaning, an IP Address that does not change when the router is restarted or turned Off and then On again.) If not, then its IP address may have been reassigned by the WiFi router box, and be different from the one in the computer's configuration. In which case, you would need to
A. choose a new, static/fixed IP Address on your local network, for the printer, then
B. set that static IP Address in the printer's WiFi setup
C. unisnstall the printer in the computer's Devices And Printers - by selecting the icon for your printer and Del-eting it.
D. then install the printer again, after a restart of the computer.