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 _f5c8363797a7e3f4d3bf559e93f72e55.sdgjtdhdhz.acm-validations.aws is not the root of its zone.
Instead, try zone transfer on sdgjtdhdhz.acm-validations.aws .
Instead, try zone transfer on sdgjtdhdhz.acm-validations.aws .