Hi
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I’m not 100% sure, but i suspect there’s an issue with mixed use of http and https. from what i read it looks like you’re able to access the web interface, but the app doesn’t work. That is pretty unexpected in most situations.
DuckDNS add-on takes a lot of the back-end work away from you, including certificate management. So following a DuckDNS guide and leaving out those parts is not necessarily going to work.
Have you seen the following guide?
If you use the let’s encrypt container with the included reverse proxy, i think the setup should be significantly less complicated.
You could skip the reverse proxy and set your HA instance to https only, that’s up to you.