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 2a02-8400-011f-0203-0000-0000-0000-0008.rev.sfr.net is not the root of its zone.
Instead, try zone transfer on rev.sfr.net .
Instead, try zone transfer on rev.sfr.net .