Xfinity App Incorrectly Showing Modem/Router as Offline - Can't Manage my Wifi

Like other users have reported, I recently switched from an Xfinity Gateway to a personal Netgear Modem/Router. Xfinity customer service had to manually update my account and remotely configure the new Netgear modem/router because the QR code wasn't being read. They provisioned my account accordingly and my modem/router appears to be online and I have internet in my home, but the Xfinity app is showing my device is offline. I need access to the device on the app to configure settings.  I have restarted my Netgear modem/router, uninstalled and reinstalled the app, unplugged the modem/router, reset all settings... still the xfinity app shows the modem is offline.  Can someone please provide a solution for this? I know others have had the same problem but I don't see how they had it resolved.