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 e1xl6mq8z5kmd80z.hosted-dkim.com is not the root of its zone.
Instead, try zone transfer on hosted-dkim.com .
Instead, try zone transfer on hosted-dkim.com .