For the records, we investigated for a customer the very same problem.
It turned out that 802.11r amendment makes Canon wireless detection go crazy and see WPA2 network as unencrypted.
Turning off 802.11r on Wi-Fi properties allows the printer to see the correctg encryption and connect.
After succesfull connection, by the way, you can even turn 802.11r back on if needed.
I have a Canon MB2720 printer and I just switched to T-Mobile home internet. I spent hours on the phone with T-Mobile and Canon and could not resolve the issue. Like everyone else on the replys on here no one has ever seen this problem…….. so I just started guessing. Went on the T-Mobile app for my router and went to Network. I changed the recommended settings against T-Mobiles advice. When I changed the WPA version to WPA/WPA2 instead of the recommended setting by T-Mobile (WPA2/WPA3) I was able to enter a password on my canon printer. When the router was set at the recommended setting by T-Mobile on the router the printer would find the wireless network like all the videos online but would not ask for a password. The videos on the internet by Canon are incorrect and needs to include this step in setting up a wireless connection if your printer does not ask for a password once it finds your network. Hope this helps the T-Mobile users.
I came across the same problem, and Canon's solution doesn't work at all, because I can't find the 802.11r parameter in my wireless router admin page at all.
But you can try this method I used, it works perfectly.
step1: change your wireless SSID to another name, i.e. change it from 'MyWirelessID' -> 'MyWirelessID2'
step2: open your mobile wireless hot point, and change it name to 'MyWirelessID', and change the password to the same one of your wireless router.
step3: on you printer setup panel, try to connect the wireless network 'MyWirelessID' (which is the wireless network provided by your mobile phone), this time, you will see the printer prompt the password, input the password, complete the wireless configuration.
step4: close your mobile phone hot point and change the wireless SSID of your wireless router back to 'MyWirelessID', then you will find your pinter can successful connect to your wireless router.
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