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 yffbqd2t54ad5o45jvob4w2wfqsoazll._domainkey.cyberiade.ch is not the root of its zone.
Instead, try zone transfer on dkim.amazonses.com .
Instead, try zone transfer on dkim.amazonses.com .