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 3s7n7fqm2co3ss6b3sxpvufzzfyil7bm.dkim.amazonses.com is not the root of its zone.
Instead, try zone transfer on dkim.amazonses.com .
Instead, try zone transfer on dkim.amazonses.com .