Thanks for reaching out.
Sorry to hear about your experience on connecting your Google Home Mini speakers to your newly set up WiFi mesh. Could you please tell us what are the steps that you tried on attempting to connect it?
Also, since this involves all your Google Home Minis, let's try to completely reset each of the Google Home Mini and attempt to set it up. Make sure that all these devices are within range from the router to get a better connection.
Let us know how it goes.
I wanted to check in and see if you managed to see Princess_S post? Are you still in need of any help with your speakers not connecting? Please let me know if the issue is still present, so we can further assist.
I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread due to inactivity.