Can't get MoCa setup

I was previously running an Apple airport express near my Tivo Roamio providing the ethernet port needed. I then used the Tivo to create the MoCa connection to my Minis.

I switched my router to a Nighthawk and bought a ECB6200 MoCa 2.0 adapter.

I attempted to connect this in my basement but I can't seem get the Tivos to find internet connection.

Line In > Splitter > ECB6200 > Tivo
-------------------- > Other Mini
-------------------- > Other Mini
-------------------- > Other Mini

Do I need to select a specific Moca channel / encryption key?

None of the Minis seem to find connection either, although they may be looking for the main box which is not finding it.

Any clues?