The issue you are facing:
for the installation I have used these two containers and my domain.:
From external network (VPN, 4G) everything works fine in https.
when i try to connect to the IP or the hostname of the machine i get:
for https: 400 Bad Request
for http: 503 Service Temporarily Unavailable
if it helps:
Router is a MikroTik
Docker host is Ubuntu Server 18.04