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 _github-challenge-casjayhak-org.hak.casjay.casa is not the root of its zone.
Instead, try zone transfer on casjay.casa .
Instead, try zone transfer on casjay.casa .