I am facing an issue that is relevant to this post, please guide me if i am doing it correct:

I have four private function apps for Dev, UAT, QA, and Prod respectively hosted in Azure V-Net behind Azure Application gateway. I have created four separate listeners with HTTPs and port 4430, 4431, 4432, and 443 respectively. I am sending API requests from dataverse for these function app using a domain name that is translated to the public IP of the application gateway. Now, I am able to access the function app using all ports but when i try to access any api end point it works for port 443 for any environment but using non standard port i do not get any response and get unauthorized error? What could be the reason?