Unable to manage gateway settings through xfinity app or via the device's management page (Primary account holder)

Usually, I manage the gateway device directly via its admin portal on my local network. However, this has stopped working with the message:

"Managing your home network settings is now easier than ever. To manage your gateway settings and other features, please download the Xfinity app."

However, in the xfinity app, logged in as the primary account holder, the Wifi tab takes me to the device--showing online--but the WiFi details button is completely missing. I'm left with 'Troubleshoot' buttons and 'WiFi Hotspots' neither of which are helpful.

Any thoughts? Is this a backend provisioning thing?