From what I'm seeing in this forum and other places on the internet, any time you make a change to any aspect of your Xfinity "Triple Play" service, or equipment, the Caller-ID transmission to the Television(s) are stopped. This has been happening going back to 2017, from what I can tell.
There must be a per-subscriber $$$ cost to Comcast-Xfinity for providing this service.
Anyway, in almost all cases, the customer had to call/visit/chat with Comcast-Xfinity to get the incoming Caller's ID back on the TV Screen.
I will be doing one of those myself tomorrow.
-Allen in Chicagoland