You got this from the HW information, right. It looks right, however I can not tell.
The USB dongle, remember to use a USB2 port and a long USB cabel extender, placing the coordinator far from everything. The zigbee dongles can be confused by nearby USB3 ports and Wifi accesspoints.
The Silicon labs stick, have you firmware upgraded it? With the Sonoff 3.0 it will not work without new firmware.