IPv6 relay doesn't work with /64 network

[johnd2]

I have /64 IPv6 from my provider. Both LAN and WAN6 have addresses, and I can reach IPv6 from my router

LAN
IPv6: 2600:6c******:1346::1/64
IPv6: fd90:******:b3ab::1/64
WAN6
IPv6: 2600:6c******:c1f5/128
IPv6-PD: 2600:6c******:1346::/64

I put all changes from https://openwrt.org/docs/guide-user/network/ipv6/start#ipv6_relay to my /etc/config/dhcp file

config dhcp 'lan'
        option interface 'lan'
        option start '100'
        option limit '150'
        option leasetime '12h'
        option ra 'relay'
        option dhcpv6 'relay'
        option ndp 'relay'

config dhcp 'wan6'
        option dhcpv6 'relay'
        option ra 'relay'
        option ndp 'relay'
        option master '1'
        option interface 'wan6'

And I don't have IPv6 on any client

[trendy]

Why are you using relay? You have a prefix delegated from your ISP (just a /64 which is lame from their part) and it is assigned to the lan interface. You should remove the relay configurations and stick with server.