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 userportal-neonova-net.prod.services.nrtc.cloud. is not the root of its zone.
Instead, try zone transfer on nrtc.cloud .
Instead, try zone transfer on nrtc.cloud .