One IPv6 directory authority unreachable?

Hi, so if you try setting up a relay, then you eventually come to setting up IPv6. The IPv6-test for reaching the authorities provided by https://torproject.org/relay/setup/post-install/: ping6 -c2 2001:858:2:2:aabb:0:563b:1526 && ping6 -c2 2620:13:4000:6000::1000:118 && ping6 -c2 2001:67c:289c::9 && ping6 -c2 2001:678:558:1000::244 && ping6 -c2 2001:638:a000:4140::ffff:189 && echo OK. The first IPv6 address is unreachable, but the others ping back. I tested it by pinging it from different places around the world, and it is unreachable everywhere. So is it ok to set up IPv6 right now? (the IPv6 ping test doesn't get completed...) Thanks.