Which version of Microbit Setup Manage are you using? 1.27? If so you could connect the Webswitch to your LAN and use 'Net info/find' -> 'Find devices' to see if it show up there. If it does and is 'reachable'(has an IP address accessible from your LAN) the try browse to it. If it isn't reachable the use 'Config' to give it an reachable IP address and then try browsing to it. The reason for this is that I would like to make sure what firmware the Webswitch has, as it should not be possible to flash an RRC firmware into a Webswitch. But there could be issues with having more than one device(RRC/WS) simultaneously connected to the PC while using Setup Manager making it looking like for ex the WS has the RRC's firmware.
You could also try disconnecting every RRC/WS from your PC, run Setup Manager and see that it finds no devices, connect the WS and see if it finds it and if it indeed shows the RRC's firmware version.