Not an apex domain
The domain 0.2.1.5.b.b.1.5.0.0.0.0.0.0.0.0.1.8.0.0.0.0.0.0.0.b.8.0.1.0.0.2.ip6.arpa is not the root of its zone.
Instead, try zone transfer on 0.b.8.0.1.0.0.2.ip6.arpa .
Instead, try zone transfer on 0.b.8.0.1.0.0.2.ip6.arpa .