I encountered this problem on my new Macbook Pro (late 2017 model). Turned out it was because I happened to grab a micro usb cable which, it seems, only supported charging. Worked fine as soon as switched to a different one.
In my case the USB cable plugs into a hub with lots of connectors on it, and that has short Thunderbolt 3 cable that connects to the Mac.
Last edited by bhyde; 07-09-2018 at 04:58 PM.
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