My AT&T Home Modem came with IPv6. AT&T finally gave me a single delegated subnet. I subnetted the /64 delegated range into 8 addresses for each interface of my 60E as /67 addresses. I took Internal7 and broke the /67 into two /69. One for Internal7 and one for 221c-AP. I configured DHCPv6 on 221c-AP. Fortinet doesn't support DUID to get device names only MAC. I created my own DHCP/DNS servers in Ubuntu 20.4.1. I can see IPv6 source and destination traffic now.
If IPv6 is the next big thing, why can't Fortinet fully support it? They don't fully support IPv6 Geographic Blocking either. Since I am a Home User, I don't get the luxury of a Sales Engineer. Another gripe of mine.