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 _47a48e46f3f9e6fa3a6f074309a039ea.api-s.axcient.com is not the root of its zone.
Instead, try zone transfer on hkvuiqjoua.acm-validations.aws .
Instead, try zone transfer on hkvuiqjoua.acm-validations.aws .