How to set external_url

I would like to set an external URL, I created an .env file including my external IP (which was created using SWITCH engines) and changed my Botpress.config.json file as follows:

“httpServer”: {
“host”: “localhost”,
“externalUrl”: “”,
“port”: 8000,
“backlog”: 0,
“bodyLimit”: “100kb”,

However, the bot cannot be reached. Could anyone provide me with an indication as to how this should be changed in order to make it work?

Your externalURL must include TCP Port.