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 _5aa5d7e3e60d8c5750a04ce16ab8a49e.vhzmpjdqfx.acm-validations.aws is not the root of its zone.
Instead, try zone transfer on vhzmpjdqfx.acm-validations.aws .
Instead, try zone transfer on vhzmpjdqfx.acm-validations.aws .