Error code TVAPP-00314 - In-progress recordings are only available on your home WiFi

Trying to watch in-progress recordings from a desktop browser. I can watch completed recordings without any issue. Just for in-progress, I always get this error.

My setup:

Modem: Hitron Coda 56 (my own device, on supported devices list)

Network gateway: Orbi RBR50

Wired LAN connection to Windows 10 desktop

ALL CONNECTIONS ARE WIRED. I am not using WiFi (Xfinity or otherwise). I am on my home network.

Possibly related: when I go to the status page (xfinity.com/support/status), it shows "Status unavailable" for "Voice and Data Modem". I *have* service this working fine, but somewhere along the line, it seems to not be detecting that I am on a registered / recognized device.