@Joseph-TP I made it working, seems Non-Address setting was correct setting for my case. In LAN, TPLink sees wrong prefix length (/64 instead of /56), but all seems to work now.

I have problems getting IPv6 functional on my BE800 router (while Asus routers work fine). My FFTH providers assigns me static public IPv4 and IPv6 /56 via PPPeO. IPv4 works fine, but no settings...