Not an apex domain
The domain 66-44-20-9.s1287.c3-0.129-cbr2.lnh-129.md.cable.rcncustomer.com is not the root of its zone.
Instead, try zone transfer on lnh-129.md.cable.rcncustomer.com .
Instead, try zone transfer on lnh-129.md.cable.rcncustomer.com .