Hi daringer,
want to take this old thread for a similar question.
The dedyn update always receives a different IPv6 Adress. IPv4 is working fine.
I checked all the point on the list and the fritzbox is configured correctly.
When I set the expected IPv6 adress in the webgui of dedyn.io it works for IPv6 till the next update.
I have seen this has been taken as a bug. If I could assist with tests I am willing to do so.
