Ipv6 support for myplex

I have the question somewhere else and @pshanew referred me to this string.
the IPv6 stops at my router because my ISP only offers 64 bit prefix which is not supported by many devices including my Nvidia shield and Google WiFi Mesh. Is it possible to use the IPv6 address of the router then use port forwarding t reach my PMS?
where do I find the Plex generated Link to my server to adjust it to the IPv6 address?
I am guessing it only works with Static IP address. but are the dynamic DNS and certificate already provided by Plex also static? or do they update regularly ?