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 8B4C680E-D689-11F0-88B4-F47F4F55E445._domainkey.dls.rs is not the root of its zone.
Instead, try zone transfer on dls.rs .
Instead, try zone transfer on dls.rs .