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 7da2dcaa-5e0f-4cbd-984e-ac713dd35e4a.4.authorize.certificatemanager.goog is not the root of its zone.
Instead, try zone transfer on 4.authorize.certificatemanager.goog .
Instead, try zone transfer on 4.authorize.certificatemanager.goog .