Open EMail-WebPage-Link in Ionic-App


i have a problem getting Deeplinks to work. I installed the plugin as the Ionic-Nativ-Deeplink Site describes.
However if i click on my email link it just opens in the browser but not in the app.
The EMail-Link for example is:

This Email-Link should work for people using the Progressiv-Web-App and people using the native Mobile-App.
Therefore it should open the app and not the browser if the app is installed, but it doesn’t.

Any suggestions what i’m doing wrong ?
I though the new Ionic-Native-Deeplink Plugin handles Deeplinks AND the url schema, meaning it won’t open the browser but the app, just by looking at the url.