Deploy to azure app service with custom Domain Name from Visual Studio

We deployed one of our applications to an azure app service. Our security team have removed the public access for all the app services, so now we have enabled public access with custom domain name

Initially it was appname.azurewebsites.net Now it is appname.xxx.com

When I try to deploy the application from visual studio 2019 publish option, custom domain name does not appear. Kindly advise what needs to be done to make the custom domain name appear while publishing.