Although I don’t use NGINX, I don’t see a path in NGINX that gets you from (outside)443->(inside)443->NGINX->HA-port (8123).
Maybe this particular HA Community NGINX guide will help. Although it is old, the last user post Sept 2024 says its still works, but you can look at his delta config too. It shows that NGINX is listening on 443, and that it is forwarding to an address (local loopback) and port 8123.
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