mon-ext-hetzner-fsn01.world4you.guru IXFR zone transfer

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 mon-ext-hetzner-fsn01.world4you.guru is not the root of its zone.
Instead, try zone transfer on world4you.guru .