How do I access an IPv6 only instance?

Created a lightsail instance as "ipv6 only". How do I access it?

{example-ipv6addr} = 2001:0db8:85a3:0000:0000:8a2e:0370:7334
Things I tried.
ssh -6 -i "key.pem" ubuntu@{example-ipv6addr}
ssh -i "key.pem" ubuntu@{example-ipv6addr}

ssh: connect to host {example-ipv6addr} port 22: No route to host I keep getting "No route to host" messages.