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.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.