Yes that is correct Sky Sports can only have 2 devices registered and you can only play Sky Sports on 1 device at a time, this is a limit that is set by Sky. When you play Sky Sports it actually uses the Sky Sports App.
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Sorry to hear you are experiencing this with your TV go. Just to clarify, are you accessing Tv Go via web browser or App?
As if you register a computer using a browser, you’ll need to use the same browser with Virgin TV Go. Using a different browser, clearing cookies or using incognito mode will be seen as a different device.