Xr500

Hi, I am having issues getting ipv6 to work. In the UK I have Gigaclear Fttp who provide the optical modem and I am using my XR500 as the router. I've gone into the advanced settings and used auto detect to see it is a 6to4 tunnel. I've entered google Dns settings for ipv6 but I see I only have ipv4 when looking at settings on my xbox series x.