Can't Access DuckDNS w/Nginx

I have installed and setup Nginx and tried the Nginx Proxy Manager as well.

I have DuckDNS setup as in the directions. I have x-forwarded setup in my config file. When I start the official addon. I can access my-domain.duckdns.org externally from https:// but it doesn’t load. The HA logo stays on the screen and continually tries to “retry” to connect. Using http:// externally gives a connection refused “site can’t be reached.” Internally both http:// and https:// just try to load. I can reach my HA from http://192.168.xxxxx https://192.168.xxxx gives a SSL protocol error.

If I use proxy manager I can get to the Web UI when I try to forward the domain to my HA ip:port and click the domain before getting the certificate to ensure it works…this to a blank web page and never loads.

http:
  use_x_forwarded_for: true
  trusted_proxies:
    - 172.30.33.0/24

I get the below error…both externally and internally.

Traceback (most recent call last):
File “/usr/local/lib/python3.10/site-packages/aiohttp/web_protocol.py”, line 334, in data_received
messages, upgraded, tail = self._request_parser.feed_data(data)
File “aiohttp/_http_parser.pyx”, line 551, in aiohttp._http_parser.HttpParser.feed_data
aiohttp.http_exceptions.BadStatusLine: 400, message=“Bad status line ‘Invalid method encountered’”

It appears to have been a setting in my Linksys router. If anyone else is having this issue and owns a Linksys router turn off the setting Express Forwarding under Connectivy>Admin.