I think the nRF Connect toolchain is missing the right driver for the CLI app on the USB dongle, or the CLI is not setting up the USB interface with the right VIN.
When I build the OT CLI app and flash it on my nRF52840 dongle, the USB stick does not show up in my OS X device tree, so there is no serial port for a terminal to connect to. My co-worker has the same issue running Windows 10 Business.
While in bootloader mode, the stick shows up as an "Open DFU Dongle" 
Flashing the stick with the sniffer app makes the stick appear as a "nRF USB product".
Flashing the stick with a pre-built CLI .hex image from a v5 build, the stick appears as a "nRF52840 MDK USB Dongle" (I don't have the v5 tool chain installed, the image was plucked from GitHub )
If I flash it with an image built from then default CLI app in the nRF Connect toolchain, the stick does not appear in my device tree at all.
My co-worker has the same issue running Windows 10 Business.
