Can you touch the red dot?
When I tap on the red dot, it takes me into the System pane. The Mini Sub isn’t listed there.
I brought this up in the recent Live Chat I had with Sonos support about my other issue (not being able to connect with Sonos from my iPad), and they weren’t able to fix it. They said that it should disappear form my system once I ship it back to Sonos as part of the return process.
It should disappear on its own, or you could reboot your router. I don’t think there is a trigger that it knows if you’ve shipped it.
On the other hand, it won’t disappear from your ‘purchased items’ list on www.sonos.com, until such time as either it is decommissioned by Sonos and/or registered to another Sonos account.
Either way, it still appearing has no impact on your system, you shouldn’t unduly worry.
I forgot to mention that I still have the Sub Mini. Can I plug it back in so Sonos can see it and then remove it from the app/system?
You can’t just remove it, but as said after a while it should quit being shown.
If it is really bugging you then you could go through the reset and reconfigure process, as you would when selling, and the rest as you would when buying. But using another e-mail and Sonos home configuration. Way too much effort in my opinion and you could always mess something up.