Not an apex domain
The domain _c8a5ba17c4650a6b98df27e6c359a6c3.jkddzztszm.acm-validations.aws is not the root of its zone.
Instead, try zone transfer on jkddzztszm.acm-validations.aws .
Instead, try zone transfer on jkddzztszm.acm-validations.aws .