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 ndg9p996b07l89prlkkif0thbvit386s.outlookmail.dk is not the root of its zone.
Instead, try zone transfer on outlookmail.dk .
Instead, try zone transfer on outlookmail.dk .