PC not recognizing S6 in dl mode.

I'm trying to take my two phones back to stock. The first one I did with no problem at all. The second though is not recognized by the PC when in download mode. Odin won't get a COM port. ADB Devices comes up empty. When I reboot the phone and am at the home screen I get both a COM port in Odin and ADB finds the device.

Any thoughts?


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