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 fliva-api-c9e5539c56c0ea24.elb.eu-central-1.amazonaws.com is not the root of its zone.
Instead, try zone transfer on elb.eu-central-1.amazonaws.com .
Instead, try zone transfer on elb.eu-central-1.amazonaws.com .