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 _a8b253328733b68a3ee172b2ac8cb6c9.comtecint.dk is not the root of its zone.
Instead, try zone transfer on xmjnffzjyj.acm-validations.aws .
Instead, try zone transfer on xmjnffzjyj.acm-validations.aws .