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 f77nh6ovg9arfkqadl4mq6ssv0t1pskh.spamfilter.io is not the root of its zone.
Instead, try zone transfer on spamfilter.io .
Instead, try zone transfer on spamfilter.io .