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 ll81-156-4-192-81.ll81.iam.net.ma is not the root of its zone.
Instead, try zone transfer on ll81.iam.net.ma .
Instead, try zone transfer on ll81.iam.net.ma .