I also have a problem controlling wemo lights from flic app (when using the hub). I am using the same LAN. It works fine with my Wemo Switch but the flic app can't find my lights, even though they work fine with the wemo app.
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I also have that Clas Ohlson dongle. It's a Cambridge Silicon Radio CSR8510 A10 inside, exactly the same hardware as https://www.kjell.com/se/sortiment/mobilt/bluetooth/usb-adaptrar/plexgear-bluetooth-adapter-med-aptx-p92954. I think Clas Ohlson simply doesn't want to take responsibility if it doesn't work on any other platform than Windows.