Hi, I'd like to enable and setup IPv6 in my ER605 v2 router but it always use IPv4. I have attached my current setup (this is temporary as I'm still planning to upgrade the access points)

I already have IPv6 enabled in my ISP. Accessing https://whatismyipaddress.com/ still says IPv6 is not detected. But connecting directly through the Wi-Fi of my ISP's modem, there is an IPv6. In my ER605 router's IPv6 WAN, there is already an ip address obtained.

Is there some wrong in my setup? Apologies, I'm new to this and still learning how to configure these kind of network.

FYI: This is my home network.