Canon printers also can't handle 2.4 and 5 networks with the same SSID.
The workaround is to give a spare 2.4 router the same SSID as your real router. turn off your real router. Connect the printer to the 2.4 router so it can be configured. Then put the spare router back in storage and turn your main router on again. The printer will then connect to the 2.4 signal of the main router.
Really disappointed in Canon not being able to handle multiple SSIDs, and eero for disabling the feature of having different SSIDs for different frequencies.
For Eero, there is now an option to disable 5GHz for ten minutes in order to connect some troublesome devices. It might work for connecting such a printer.
The workaround is to give a spare 2.4 router the same SSID as your real router. turn off your real router. Connect the printer to the 2.4 router so it can be configured. Then put the spare router back in storage and turn your main router on again. The printer will then connect to the 2.4 signal of the main router.
Really disappointed in Canon not being able to handle multiple SSIDs, and eero for disabling the feature of having different SSIDs for different frequencies.