2A3409DB860854BCC607D5B43F43BC3D.E516E2142B3B781ACABBF42159659A43.6286295d98594.sectigo.com IXFR zone transfer

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 2A3409DB860854BCC607D5B43F43BC3D.E516E2142B3B781ACABBF42159659A43.6286295d98594.sectigo.com is not the root of its zone.
Instead, try zone transfer on sectigo.com .