Any device that is available for use in Roon should be able to be found at Settings > Audio. Since these devices aren’t showing there, they aren’t being properly seen by Roon.
Can you confirm that these devices are on the same subnet as the Core?
Is there any difference in how these Google Home Mini devices are connected to the network compared to the one that is working?
No, all the Chromecast and Google Home Mini’s are on the same wifi network; it could be possible that they connect to different apps. . But both are on the same subnet
Using the Google Home app, can you confirm that all of the Chromecast devices are set up and fully updated? If there are any updates available for the devices try giving that a try and let us know if that helps.
Now that I have the timestamps, diagnostics have been enabled on your account. The next time your Core is active a diagnostics report will automatically be generated and uploaded directly to our servers
Once that’s been received, I’ll be sure to update this thread and pass the diagnostics over to the team for further analysis.
Updated 12/10/2019.
I still have issues reliably connecting Roon to Chromecast devices, including Google Home Mini and Chromecast Audio, to the point where I’ve given up using them.
Roon-tested my you know what…