@stormgrass This one - https://docs.digitalocean.com/products/networking/ipv6/how-to/enable/#on-existing-droplets . Did you do this?
Ah, no, that point I missed. Am trying to fix it now, but the yaml indicated in the doc doesn't exist. So, I've created it and get hit with a syntax error, even though it's a copy of the contents specified.
Anyway, I'll keep investigating, but I think you can mark this as resolved now. Thank you!