@Luca Franzoni Can you please verify that your site files were successfully deployed by locating them on the web app storage?
To view your web app's storage:
- go to portal.azure.com
- Locate your web app in the portal
- Select the 'advanced tools' blade
- Select 'go'
- Select 'debug console' and then 'cmd'
- Navigate to where you expect to find your site files to ensure they are actually landing in the web app
If you see your site files, let us know so we can move onto the next step with you.