6B9HB357NLS8LD0CIFU4C0K1LA3O0TUT.ecom.net.do AXFR zone transfer

Not an apex domain The domain 6B9HB357NLS8LD0CIFU4C0K1LA3O0TUT.ecom.net.do is not the root of its zone.
Instead, try zone transfer on net.do .