Not an apex domain
The domain 209-6-148-108.s5482.c3-0.bkl-cbr1.sbo-bkl.ma.cable.rcncustomer.com is not the root of its zone.
Instead, try zone transfer on sbo-bkl.ma.cable.rcncustomer.com .
Instead, try zone transfer on sbo-bkl.ma.cable.rcncustomer.com .