Thanks for posting here in the Google Nest Community.
I wanted to follow up and see if I could be of any help. A few things: Is this a Nest device? If so, which Nest device? By any chance are you using multiple accounts? If so, have you checked these accounts if this device is linked to any of them? If it’s a third party device have you tried unlinking them from your Google Home app assistant settings? Check these steps below that might help you.
Remove Nest devices from a home:
Remove third party devices:
Check this helpful article too.
Let me know how it goes.
Hi, thanks for your help.
All 10 devices were "cast" devices, such as Chromecast, Google Home speakers, hubs and nest Wi-Fi hubs.
I see now that the problem has resolved itself. Those 10 devices are no longer mirrored in my second home.