I can´t make Contacts plugin work on DevApp, please help

I want to list contacts, which I thought would be very easy, but a week has passed and I can´t get it to work.

The DevApp lists the cordova-contacts-plugin: https://ionicframework.com/docs/pro/view.html#plugin-support

I follow the instructions on the documentation: https://ionicframework.com/docs/native/contacts/

Yet it does not work. Does it work for anybody?

All examples I found were outdated and I couldn’t make them work.

Thanks for any help.