I am struggling to get IPv6 working on my home network with the Deco XE75. I know my ISP supports it; if I connect directly to the SSID advertised from the modem/router, my device gets an IPv6 address assigned and I can ping ipv6.google.com.

When I enable IPv6 on the Deco, I can get everything to work if I select Bridge for the internet connection type. However, this apparently gives every device on my network a publicly accessible IP address and I do not want that. The only other way I can even get a WAN IPv6 to show up in the config is to select Dynamic IP with Prefix Delegation turned off. In this mode, there's no valid LAN Address Prefix and my devices are not getting IPv6 addresses assigned. 

Full config is below:

Internet Connection Type: Dynamic IP

Get IPv6 Address: Auto

Prefix Delegation: Off

DNS Address: Auto

Assigned Type: SLAAC+Stateless DHCP

Am I missing something with the configuration here? Any advice for getting this to work?