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 nsa2-cln-out-prd-nl2-lgs-net-29.edge.unified.services is not the root of its zone.
Instead, try zone transfer on edge.unified.services .
Instead, try zone transfer on edge.unified.services .