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 cg-icva-prod-amd67cl40-gs523.s.smailru.net is not the root of its zone.
Instead, try zone transfer on s.smailru.net .
Instead, try zone transfer on s.smailru.net .