btars-prod15-ae-3-fa.australiasoutheast.cloudapp.azure.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 btars-prod15-ae-3-fa.australiasoutheast.cloudapp.azure.com is not the root of its zone.
Instead, try zone transfer on australiasoutheast.cloudapp.azure.com .