HTML Widget URL: setting URL value with Set Widget Value Action

I can’t get this to work, even without reserved characters…

I must have to do with the User Login Event not being able to change the value of the HTML Widget on the custom Entity Screen, possibly since the screen isn’t loaded. Using an Automation command embedded in the screen along with the HTML Widget must work, since they are on the same screen, and the screen is loaded and in focus with both Widgets placed on it.