Unable to delete Port Forward

I am using the Xfinity App to try and delete a port forward rule on a device I no longer have, but nothing happens when I press "Delete this Port Forward" on the "Are You Sure?" screen.  The port forward shows "No Associated Device" and I can go to the Edit screen, but the Apply button is disabled.

I am using the Xfinity App on an iPhone 14 Pro Max and I have a CGM4331COM gateway from Comcast.  I have tried restarting the gateway, uninstalling/reinstalling the Xfinity App, and even logging into the gateway to remove the Reserved IP from that device.  Nothing I've tried will allow me to delete the Port Forward rule.  

I called support and they said it could only be deleted from the app and there was nothing they could do about it.