This is what solved it for me. Read all the other replies and tried it all. Do make sure all the necessities are set up for MF scan utility: drivers, printer sharing on, windows firewall, correct install files for your model canon printer, do a ping request from the pc to your printer to make sure the network is working. So I noticed in the device manager, Canon MF632/634 and Canon MF632C/634C were both under the imaging devices tab. I followed another reply thread saying to disable both of them and then update them manually: right click->disable (both), then right click->browse computer for drivers->let me pick list of available driver->install the listed drivers. If you installed the correct drivers already, there should be an option there already. Just click next and it will update. When I did the aforementioned process steps with the Canon MF632C/634C, there was actually two options after clicking let me pick list of available drivers (Generic software device and Microsoft eSCL Class Driver). I think I chose the first option, generic software device, and after it updated, the Canon MF632C/634C moved from under the image devices tab to the software devices tab. If it did not move to the software devices tab, update the Microsoft eSCL Class Driver. Also, when this happened, both of them, Canon MF632/634 and Canon MF632C/634C, were re-enabled automatically. Not sure what that did, but it is now working on my laptop running Windows 11 24H2. I also have a desktop PC that is running on windows 10 which did not have a problem. Upon checking, it seems the issue with my laptop running on Windows 11 is the Canon MF632C/634C has to be under the software devices tab, which it was already that way on my Windows 10 PC. So, my guess is the software signature driver of the scanner driver has to be signed/be under the software devices tab and not just under the image devices tab where the Canon MF632/634 is. Hope this helps.
