Not an apex domain
The domain 216-15-20-64.s3134.c3-0.161-cbr1.lnh-161.md.cable.rcncustomer.com is not the root of its zone.
Instead, try zone transfer on lnh-161.md.cable.rcncustomer.com .
Instead, try zone transfer on lnh-161.md.cable.rcncustomer.com .