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 27D3B31A-ABEF-11EA-9418-398AB0979860._domainkey.ttm.bg is not the root of its zone.
Instead, try zone transfer on ttm.bg .
Instead, try zone transfer on ttm.bg .