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 76455a42-7083-4e51-8d73-5ce751790ac6.10.authorize.certificatemanager.goog is not the root of its zone.
Instead, try zone transfer on 10.authorize.certificatemanager.goog .
Instead, try zone transfer on 10.authorize.certificatemanager.goog .