Using NDP in ipv6 configuration

Hello everyone, I want to give every lan device IPv6 connection.
Router itself gets proper global IPv6 address and can ping ipv6.google.com.
But with Merlin IPv6 configuration page,
Connection type: Native,
DHCP-PD: on,
Auto Configuration Setting: on,
Connect to DNS Server automatically: on,
Enable Router Advertisement: on.
Lan devices can only get fe80::f4f2:aeb7:XX:XX%4 IPv6 address, can't ping ipv6.google.com neither.
I want to know if it is a ndp problem and how to solve it?
Any...

Using NDP in ipv6 configuration