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 4cdbfb4585bdbdee91d110f747be6f84.e35bc49c559c1a3e8714950ae020dd69.3bp5ybswmw5knslk55q6.sectigo.com is not the root of its zone.
Instead, try zone transfer on sectigo.com .
Instead, try zone transfer on sectigo.com .