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 134-231-79-101.grt01-1561.grt.ne.allofiber.net is not the root of its zone.
Instead, try zone transfer on grt01-1561.grt.ne.allofiber.net .
Instead, try zone transfer on grt01-1561.grt.ne.allofiber.net .