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 8f7e9d019ae69c5136f9a559cd5dc042.freshdesk.com is not the root of its zone.
Instead, try zone transfer on freshdesk.com .
Instead, try zone transfer on freshdesk.com .