AWS Amplify with Angular - Stop URL redirecting to index

I have an Angular app that I recently migrated to AWS Amplify. I am having a problem, though, with creating links to particular pages (for example, sending a confirmation link in an email). Links automatically redirect to the index page. The same thing happens if I try to navigate to a page by entering its URL in the address bar, or if I simply reload the page.

I have an app-routing.module.ts file that used to work before moving to Amplify. When run from localhost, the links still work fine. How do I fix this?

App-routing.module:

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

const routes: Routes = [
  {
    path: '',
    loadChildren: './intro/intro.module#IntroModule'
  },
  {
    path: 'login',
    loadChildren: './login/login.module#LoginModule'
  },
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

app.module

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ReactiveFormsModule, FormsModule } from '@angular/forms';
import { MaterialModule } from './material/material.module';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { HttpClientModule } from '@angular/common/http';
import { NgSelectComponent } from './ng-select/ng-select.component';
import { NgxChartsModule } from '@swimlane/ngx-charts';
import { AmplifyAngularModule, AmplifyService } from 'aws-amplify-angular';


@NgModule({
  declarations: [
    AppComponent,
    NgSelectComponent,

  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    ReactiveFormsModule,
    FormsModule,
    BrowserAnimationsModule,
    MaterialModule,
    HttpClientModule,
    NgxChartsModule,
    AmplifyAngularModule
  ],
  exports: [
  ],
  providers: [
    AmplifyService,
    { provide: 'APIRoot', useValue: 'https://app.rivver-platform.com/api/' },
    { provide: 'colors1', useValue: ['#3dcc85','#ffbe5c','#7b64e0','#ff8370'] },
    { provide: 'colors1', useValue: ['#3dcc85','#ffbe5c','#7b64e0','#ff8370'] },
    { provide: 'colors2', useValue: ['#51c8e0','#7b64e0','#3dcc85','#ffbe5c'] }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

app.component

<main [@routeAnimations]="prepareRoute(outlet)">
<router-outlet #outlet="outlet"></router-outlet>
</main>

app.component.ts

import { Component,OnInit } from '@angular/core';
import { RouterOutlet, Router } from '@angular/router';
import { slideInAnimation } from './animations';
import {DomSanitizer} from '@angular/platform-browser';
import {MatIconRegistry} from '@angular/material/icon';
import { LocationStrategy } from '@angular/common';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
  animations: [
    slideInAnimation
    // animation triggers go here
  ]
})
export class AppComponent implements OnInit {

  private loaded = false;
  constructor(iconRegistry: MatIconRegistry, sanitizer: DomSanitizer, private locationStrategy: LocationStrategy, private router: Router) {

  ngOnInit() {
    let _this = this;
    setTimeout(function(){
      _this.loaded = true;
    },1);
  }
  prepareRoute(outlet: RouterOutlet) {
    if (!this.loaded){
      history.pushState(null, null, location.href);
    }
    return outlet && outlet.activatedRouteData && outlet.activatedRouteData['animation'];
  }

}

EDIT: I tried removing prepareRoute, AmplifyAngularModule, and AmplifyService but the problem persists.