How to fix ' no process is listening to the 443 port using http' while deploying a pyrogram bot to back4app?

Question

I am constantly getting it looks that no process is listening to the 443 port using http until the deployment fails.

In the meantime, the bot seems to be working perfectly on telegram.

I have been trying to host my pyrogram-telegram bot to back4app. In the Dockerfile, I have added Expose 443/tcp as it's required. I expected the deployment to be successful as the bot runs perfect despite the error.