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 fc834aa5003bf2cfe61121ba002bf54f.9cbedf256b117525e6e80bc3b820c8f5.t0011945001749107566.sectigo.com is not the root of its zone.
Instead, try zone transfer on sectigo.com .
Instead, try zone transfer on sectigo.com .