I see others have variations of this problem as well which is really concerning.
I used the Google Wifi app for years with 3 gWifi Points and zero issues, then migrated to Home as instructed this past summer. All was fine for a while until I added a 4th Point to the network about a month ago (interesting that several others had similar issues also in September 2021). I was able to use the Home app to complete the process but some time afterwards I can no longer manager my Wifi network in the Home app, the button is gone. Restarting, creating a new home, unplugging the 4th point... none of it works. I only have 1 Google account and no other managers. Google support is unable to see any wifi network associated with my account at all and yet, everything continues to work fine, but I'm flying blind with no management.
The only answer so far is to factory reset the network and start over, which is unacceptable. I have dozens of connected devices, custom port forwarding and firewall rules, Assistant-integrated home automation that connect to downstream hubs... To start over now I might as well use a different mesh device as I'm not sure this problem won't happen again in the future. Google Wifi suddenly feels very unstable after years of faithful service.
I need a resolution that isn't a factory reset, or I'm abandoning the product.
Yeah, I've cleared cache, data, reinstalled, deleted my home/created a new home, attempted to add a new wifi device... I even tried loading a year old Google wifi APK just to see if I could get at it that way.
Does anyone know where the home app stores the configuration files? Digging through the \android\data space I don't even see a com.android path that relates to the home app.
I still don't have an answer for a fix on this. Most people are having the best luck uninstalling and reinstalling the app and performing network resets, but you've already done those steps. Did we do a cloud services reset? If not, give that a try. We've seen that work for some as well. Those steps are below.
Open the Google Home app.
Tap the WiFi icon.
Select Privacy settings.
Toggle Nest WiFi cloud services OFF and wait for 30 seconds, then back ON.
Once done, close the Home app and perform a full network restart to ensure that the new settings are in place. To do this, I would recommend doing a power cycle on your network.
Disconnect the power adapter and the Ethernet cable from the Nest WiFi router.
Disconnect the power adapter from the Nest WiFi points.
Disconnect the power adapter from the modem. Allow all devices to stay disconnected from the power for 5 minutes.
Connect the power back to the modem only and wait for it to fully back up. All lights should be lit up before moving to the next step.
After the modem is back online, connect the Ethernet cable back to Nest WiFi router's WAN port (globe symbol port).
Connect the power back to the Nest WiFi router and to the Nest WiFi points. Wait until they're all fully back on.