NGINX Proxy & SSL not working

I need to pile-on that the lack of https on this product is maddening.

So to solve this (or trying to solve it), I’ve installed NGINX and setup a Proxy host. However, hitting the domain name I have set-up, I’m getting “Bad Gateway” response. I have port 443 forwarded in my router. To confirm I don’t have some other networking setting messed-up, I changed the settings to point to my Synology NAS, and it works great. So I know NGINX as well as my domain settings are correct.

I’ve tried:

Scheme: https
Forward Hostname/IP: umbrel.local
Forward Port: 443

as well as:

Scheme: https
Forward Hostname/IP: (local IP address of my umbrel)
Forward Port: 443

Also tried http and port 80 as well, just to see if that works - Nada

And to confirm I have my SSL successfully applied and NGINX as well and forcing https

Any thoughts as to what I’m doing wrong here?