I have an Angular application which I can deploy to Azure App Service without any issues.
First I compile my application using the following command:
ng
We had also the problem for our i18n multi-languages website created by angular-cli.
What you need:
1) ensure that you have only 1 web.config in the root folder (not under ./fr or ./en)
2) ensure that your fr/index.html has the right base tag
3) ensure that your en/index.html has the right base tag
4) the content of your unique web.config needs to include the following code:
The "appendQueryString" is needed if you have some query parameters with your URL.