So we have created this very simple web app for young students, https://geoport.maps.arcgis.com/apps/webappviewer/index.html?id=b2a600044ded4d07a0beee6db671f291
We want anyone to be able to open the page and use the directions widget.
According to this, https://doc.arcgis.com/en/web-appbuilder/create-apps/widget-directions.htm
You can give public access (use your credits) to the directions widget (used in web app).
What link should be added to make this work?