8B4C680E-D689-11F0-88B4-F47F4F55E445._domainkey.dls.rs AXFR zone transfer

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 .