Yes you can able to see IPv6 at your browser, but actualy there is always middlewhere sofware level (NLB, ALB, NAT) to reach real backend server, which creates bottle neck. For large scale enterprises this creates issue, even for cloudproviders, I have encountered bottle neck at some Major cloudprovider which causes snowball impact to whole cluster retry mechanisms and 4 hours outage for us and some other customers :D if the 2 enterpise has machine to machine IPv6 connectivity, this is will not happend.

I’m on 4g

My v6 endpoint is unreachable. My v4 one is fine.

I learned recently that France IPv6 adoption is also very high.