This is the IP of my desktop. on other devices the last 4 blocks change leading me to believe I got IPv6 /64 network for myself.

So in TP-Link interace I created this LAN Host record 2a00:1028:96ca:fe76::1/64 /1-65535

Which to me means all devices in this LAN on all ports but ICMP(wtf TPLINK).

Then I set this but if I do that IPv6 doesn't work for me.

It works with the FW disabled or set to Allow all that's not defined.