240e3850bb78c2093d23c88005791e90.0a90883ce0cf3172e7273aa07fa455b2.qb3mz0db.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 240e3850bb78c2093d23c88005791e90.0a90883ce0cf3172e7273aa07fa455b2.qb3mz0db.sectigo.com is not the root of its zone.
Instead, try zone transfer on sectigo.com .