Currently seems to be taking ages to issue certs
$ fly certs list Host Name Added Status tiles.anuinwardbound.com 28 minutes ago Awaiting certificates storage.anuinwardbound.com 28 minutes ago Awaiting certificates storage.bigdr.ink 4 weeks ago Ready tiles.bigdr.ink 4 weeks ago Ready
DNS is working.
$ dig +short _acme-challenge.tiles.anuinwardbound.com txt "tiles.anuinwardbound.com.****.flydns.net." dig +short tiles.anuinwardbound.com aaa 137.66.**.**