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 aobpgn8g54hk6lrifho6o4fjj0ibsu1a.itfservice.dk is not the root of its zone.
Instead, try zone transfer on itfservice.dk .
Instead, try zone transfer on itfservice.dk .