a4426521437ad42b6baedae66b7f2092-62529caf5ab986d6.elb.ap-southeast-1.amazonaws.com IXFR zone transfer

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 a4426521437ad42b6baedae66b7f2092-62529caf5ab986d6.elb.ap-southeast-1.amazonaws.com is not the root of its zone.
Instead, try zone transfer on elb.ap-southeast-1.amazonaws.com .