Changes since SOA version
IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.
Not an apex domain
The domain ac.69437655fddfd7ea07b09b8e1e2784d1.testedomainsf.oi.com.br.validate-akdv.net is not the root of its zone.
Instead, try zone transfer on validate-akdv.net .
Instead, try zone transfer on validate-akdv.net .