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 _aae8475cb2316ef1d88beccb5e142549.pbdev.appletree.co.uk is not the root of its zone.
Instead, try zone transfer on tfmgdnztqk.acm-validations.aws .
Instead, try zone transfer on tfmgdnztqk.acm-validations.aws .