How I fixed not having an IPv6 address at home
On a “What is my IP” site I found it was no longer reporting an IPv6 address when I knew my ISP had assigned one.
I realized the problem what I had added an additional router was now double NAT’ed, breaking IPv6.
The solution was to go into my nested router’s settings and enable “bridge mode” AKA “Wireless AP” mode, which put it in the same IP range as the ISP router and resolved the issue.
Even the pros get caught by this snag. Excellent PSA!