Not an apex domain
The domain 24-136-29-240.s494.c3-0.demp-ubr1.chi-demp.il.cable.rcncustomer.com is not the root of its zone.
Instead, try zone transfer on chi-demp.il.cable.rcncustomer.com .
Instead, try zone transfer on chi-demp.il.cable.rcncustomer.com .