screenshot

The width of the link (line) can be modified, but the color does not change.

I've tried many things

series.links.template.setAll({
      strokeWidth: 2,
      strokeOpacity: 0.5,
      color: am5.color('#ffffff'),
      links: am5.color('#ffffff'),
      link: am5.color('#ffffff'),
      fill: am5.color('#ffffff'),
      strokeColor: am5.color('#ffffff'),
      background: am5.color('#ffffff'),
      backgroundColor: am5.color('#ffffff'),
      stroke: am5.color('#ffffff'),
      templateField: 'nodeSettings',
      configField: {
        fill: am5.color('#ffffff'),
        stroke: am5.color('#ffffff'),
        strokeColor: am5.color('#ffffff'),
      },
      strokeLinejoin: 'round',
    });