found an old thread here: https://community.tp-link.com/en/home/forum/topic/593280. My public IP address (which duckdns shows) is different from the IPV4 address that I see in my router settings....

I have set up port forwarding to access my Home Assistant router remotely, but it doesn't seem to be working. I would expect that typing in my IP address to a browser would get me to the HA login...