Hi @papatubz - are you using the official Xbox One controller? 3rd party controller is not officially supported and may have unknown behavior according to the help article.
Also when you say it can't connect to bluetooth, what kind of error are you getting? Are you having trouble connecting to the computer itself using bluetooth? If that's the case, then it's a Windows issue and not related to Stadia.
If you meant that the controller pair successfully with the Chromebook, and not recognized by Stadia, it's also worth to make sure your Chrome version has the latest update, and also try to do it through Incognito mode.
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Stadia Guides are not employed by Google. Opinions are my own.
