It is not triggered when I enter the domain name directly in the browser.

That's by design.

When you type a URL in the browser on Android, it doesn't trigger any intent that can be opened in any app, because you just want to visit the URL you entered.

Now, if you click a URL somewhere, then Android tries to find an app that supports that URL and opens it.

Source: https://developer.android.com/training/app-links#android-app-links