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 fqk3f16vrgmh4tf8320js3pb1c9u6d5n.vjm.dk is not the root of its zone.
Instead, try zone transfer on vjm.dk .
Instead, try zone transfer on vjm.dk .