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 okt6vj3t8osqle0u4js1obk36th68m20.bibLIOpOlIs.infO is not the root of its zone.
Instead, try zone transfer on bibLIOpOlIs.infO .
Instead, try zone transfer on bibLIOpOlIs.infO .