can't adb to MXQ Pro Quick Play via USB - Android Q&A, Help & Troubleshooting

I have an MXQ Pro Quick Play TV box (Amlogic S905). I have USB Debugging enabled, and can connect my Windows 10 PC to the box via USB no problem with the Amlogic USB Burning Tool.
However, I cannot connect via adb thru USB, but I can do so thru network connection (e.g., "adb connect 192.168.1.112"). But I believe a network connection is impossible when the box is in recovery mode, so I can't do adb sideload in TWRP.
When I attach the box via USB, the PC shows no new devices (whether in recovery mode or not).
Any help would be appreciated.

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