I installed the drivers for the USB dongle from the CD it came with. I hit the sync buttons and they do the thing with the lights but Windows never sees it. My phone can see the Joycons and connect but my computer can't.Do you mind listing the steps you use? Are you pushing the little pair button? Did you install drivers or did Windows recognize it immediately? Do any other devices connect, such as your phone?
That adapter looks like a rebranded version of the one I bought so it should work... I'm running Windows 10 using generic drivers though.