Image acquisition toolbox can not detect multiple point grey cameras (Flea3)

Hi, I'm using Point Grey cameras Flea3 USB3.0. In both image acquisition tool and FlyCapture2 software, I can identify each camera when connected to my laptop separately. However, when I connect the 2 cameras to the laptop in the same time, image acquisition tool can detect one camera only, while FlyCapture detects both of them. Does anyone have a good solution to that? Thanks!