euf4400648-uat-ext.sys.ntt.eu 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 euf4400648-uat-ext.sys.ntt.eu is not the root of its zone.
Instead, try zone transfer on sys.ntt.eu .