Activated Route URL Always Empty

if you want to get the current URL, you can import the location import from angular/common as below

import {Location} from '@angular/common';

constructor(public location: Location ){ }

let currentUrl = this.location.path();

can be used in NavigationEnd subscriber

The definition of the ActivatedRoute is:

Contains the information about a route associated with a component loaded in an outlet. An ActivatedRoute can also be used to traverse the router state tree.

That means that if you inject it in the service, you will get the ActivatedRoute from the AppComponent. Which would always have the path of "".

You can traverse the state tree to find the last activated route like

this.router.events.pipe(
 filter(event => event instanceof NavigationEnd),
 map(() => this.activatedRoute),
 map(route => {
   while (route.firstChild) {
    route = route.firstChild;
   }
   return route;
  }),
  map(route => route.url)
 )
.subscribe( // ... do something with the url)