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 _6688ddb13f65ab80e1ed7c68d1c8b8ee.qxcwttcyyb.acm-validations.aws is not the root of its zone.
Instead, try zone transfer on qxcwttcyyb.acm-validations.aws .
Instead, try zone transfer on qxcwttcyyb.acm-validations.aws .