Module 'Toybox.Attention' not available to 'Background'

Hi!

I am trying to use the 'Toybox.Attention' from a background process, but I am getting following error:

import Toybox.Background;
import Toybox.System;

(:background)
class BackgroundServiceDelegate extends System.ServiceDelegate {

    public function initialize() {
        ServiceDelegate.initialize();
    }

    public function onTemporalEvent() as Void {
        System.println("Background event occured!");
        var vibeData =
        [
            new Attention.VibeProfile(50, 2000), // On for two seconds
            new Attention.VibeProfile(0, 2000),  // Off for two seconds
            new Attention.VibeProfile(50, 2000), // On for two seconds
            new Attention.VibeProfile(0, 2000),  // Off for two seconds
            new Attention.VibeProfile(50, 2000)  // on for two seconds
        ];
        Attention.vibrate(vibeData);
        // Background.requestApplicationWake("Your timer has expired!");
        Background.exit(true);
    }
}

Am I missing some configuration, is there something else I am doing wrong, or is that simply not possible?

If this is not working, is there a way to avoid the confirmation dialog at `Background.requestApplicationWake`?

Kind regards
Daniel