Not an apex domain
The domain b.f.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.2.1.0.2.1.0.1.0.0.2.6.2.ip6.arpa.eu.iphmx.com is not the root of its zone.
Instead, try zone transfer on eu.iphmx.com .
Instead, try zone transfer on eu.iphmx.com .