I see is coming from a couple of Amcrest cameras
Oh yeah, that still seems to be from your LAN. On the Mikrotik set your WAN interface in the filters tab of the packet sniffer. Also if you haven't already, your WAN shouldn't be bridged with your LAN, since your router will route between them, a bridge is like a network switch.
Basically I'd like to see the Router Solicitation on your WAN from your Router, and hope that your ISP responds back with a Router Advertisement; or a Solicit for DHCPv6, and the whole exchange.
Also 2001:470:1f06:redacted looks like a Hurricane Electric IP.