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 2i035azlee.spf.mailauth-us.ironscales.com is not the root of its zone.
Instead, try zone transfer on mailauth-us.ironscales.com .
Instead, try zone transfer on mailauth-us.ironscales.com .