@RGJ – I like your solution! Do I force-https with the last suggestion? RE proxy_pass https.
EDIT: I get a 502 if all I do is use proxy_pass https://192.168.86.108
EDIT2: I concealed 80 on Discourse via app.yml and it was still broke–I just re-read your post, does the Discourse container possess it’s own instance of Nginx? So, in effect, I am passing a proxy to a proxy? Sorry, I am really confused at this point.