Why the touch is not working when connecting touch USB cable to HDMI 1 under VGA?

If the signal input is under HDMI 1, please connect the USB touch cable to TOUCH-USB1.
If the signal input is under HDMI 2, please connect the USB touch cable to TOUCH-USB2.
If the signal input is under HDMI 3, please connect the USB touch cable to TOUCH-USB3.
If the signal input is under HDMI 4(MHL) or VGA, please connect the USB touch cable to TOUCH-USB4.
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