Port forwarding done with router but unable to test app in Google home

Third party integrations
1

I am trying to integrate my Google home (Google assistant) by following this guide:

I have a TP-Link Archer VR900 Modem Router and had done the port forwarding as per this guide:

NAT Forwarding > Virtual servers section has this details:
Service type: HTTP
External Port: 80
Internal IP: 192.168.1.108 (this is my Raspberry PI 4 where HA is stored - I’ve checked and it is static)
Internal Port: 8123

When I go to Google Home App settings and choose [test] my test app, it re-directs to homeassistant.local but could not establish connection.

2

being a noob on networking, I realised that with protocol http:// works and not with https:// which is where the [test] my test app that Google Home re-directs me to.

How do I make it secured connection (https?)

3

https is typically on port 443, so you need to make sure that is open as well and redirecting back to your server on 8123. In my setup, I have 8123, 80, and 443 port forward rules setup to make sure all bases are covered.