I was having the same issue - phone recognized by Windows when turned on but not recognized by Odin in download mode - and it was caused by USB cable connected to USB 3.0 port. Resolution was to re-connect the cable to USB 2.0 port.
I was having the same issue - phone recognized by Windows when turned on but not recognized by Odin in download mode - and it was caused by USB cable connected to USB 3.0 port. Resolution was to re-connect the cable to USB 2.0 port.