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 2a02-8400-0004-0180-534d-5450-0000-0000.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 .