I found auvidea J140 carrier board is using A19 as USB2_EN_OC, but on the OEM datasheet, A19 is listed as reserved pin.
Could anyone tell me A19 can be used if I connected to my board?

Hi, pin A19 is unconnected in module, please do not use it.

The USB2_D+/- differential lines that I intend to use for USB 2.0 are not working. Is this because my A19 pin(USB_VBUS_EN2) is NC, and should be going to the VDD of tje USB connector?

If its the case that A19 is in fact disconnected can I use one of the other USB_VBUS_EN? pins?