[13:00:42] INFO: OK ipaddress
NOCHANGE
[13:05:43] INFO: OK ipaddress
NOCHANGE
and so on.
According to the port scanner 8123 is forwarded correctly but 443 is not. I have consulted every forum that I could find regarding forwarding of 443 but it seems that it’s blocked by my ISP (Spectrum / Charter).
How does your nginx or configuration.yaml looks like?
Here you just created certificate and dns record, but you need to tell HA to use it.
Either in configuration.yaml only (then http would not work at all, regardless if from inside or outside, and you would have trusted cert warnings unless you have dns record on your local network for duckdns domain) or in nginx config + configuration.yaml where you define that internal is http, external would be https.
But if you do port forward, it needs to be forwarded to something that listens on port 443 to say it is opened.
If your HA listens on 8123, forward (if your router allows you to set different outside/inside ports) 443 to 8123 locally. It should say it is open but it will still be just plain http, not https.