Tethering does not work with Canon cameras on the latest update (10.15.2) of macOS Catalina.
Cannot communicate with the camera from Lightroom or from EOS Utlity 3.11.1 Get an error message "Failed to communicate with Camera. Check connections". Tried connecting with two different computers and two different USB cables. Problem appears to be with camera itself. I can still take photos and view them inside the camera. I just can't get them out. Any ideas?
I understand you are unable to connect your EOS 5D Mark II to your computer. I am sorry this is the case. What is the Operating system and computer type on the machine you are using?