Not an apex domain
The domain 8BC2E8F48B2C35D9B82F1C8CFCA81418.5A8349868BC03A9D446616ED4CB7D264.nV5KQ55F5kCNi12d5yM7.sectigo.com is not the root of its zone.
Instead, try zone transfer on sectigo.com .
Instead, try zone transfer on sectigo.com .