Hello,
Please ensure that you have DisplayLink powered device - so a device that has DisplayLink chip in it. typically there is a sticker with DisplayLink logo on the product itself. But you will also find this information on the manufacturers website in the product description/specifications, user guide etc.
If you have non-DisplayLink product it will not show any monitors detected as the driver will have no device to connect to.
Once you have confirmed that the product is powered by DisplayLink technology please ensure that you do see the docking station under the USB bus as per
My DisplayLink device does not work at all when connecting on macOS X.
If you do not see the device under the USB bus it is worth checking with the manufacturer's website if there are any firmware updates available. If you have further issues please contact the support team directly under:
technical-enquiries@synaptics.com
As each case is unique there is no one solution for each user.