... do you have a
tuning adapter from TWC connected to your Roamio Pro?
If so, you must be aware that the "TV/RF Out" port of tuning adapters (TA) do NOT pass MoCA signals, so a MoCA-enabled device daisy-chained off a TA's TV/RF Out port would not be able to communicate via MoCA. As joestan indicated, you would need to use a 2-way MoCA-compliant splitter to feed coax to the tuning adapter and Roamio Pro separately; in addition, to protect the tuning adapter from the MoCA signals (
see here), you would also need to install a MoCA filter on the coax input to the tuning adapter.
See Step #5 in the
Cox tuning adapter setup document for a good diagram showing how to properly connect a TiVo and tuning adapter in a MoCA environment (excluding the Ethernet connection you will require for the TiVo). And, yes, this connection setup applies to TWC tuning adapter installs, as well.