Sadly, we all face that here.
It's called a support forum, but often all we get is boilerplate responses or copies of the same instructions our devices came with. So sad.
A second device should setup like the first. I think, right now, that the current firmware is bugged. You may have better luck when the next firmware update comes out.
Many of us with V1 Nest Hubs have been having an issue where we pair a bluetooth speaker or soundbar and it pairs, it reports connected and is the default audio device, but all sound comes out of the Nest Hub speaker instead. It's been a month. All we get for responses, when they do come, is either generic boilerplate that doesn't mention the device specifically, or instructions on how to pair bluetooth devices, despite our having explained that it pairs and is connected, but only misroutes the audio to the internal Nest Hub speaker... Then there was the suggestion that we reset all of our devices which can take quite some time, and doesn't change the behavior, because it is a firmware bug that came with the January firmware update.
I wish you luck with your issue. Rest assured, it's a problem they will eventually fix. Have patience.
Thankfully it's a secondary device and not a primary failing to setup as you describe.
