I am successfully using your service for over a year now. Thank you very much for that!
Unluckily the IPv6 forwarding is not working anymore. (I am not sure for how long, something between a few days and a few weeks). I can successfully reach the given IP (which hasn’t changed for over a year) from the outside world, but not via the dynv6 service. Only IPv4 works. I have to say that nothing inside the working system has changed and is has to be a change that was performed on your system or an error on your service side. I hope you can get it working again, for the meantime I am going to hardcode the address as an unhappy workaround.
Thank you in advance.