angular2-jwt: Authorization header not being sent - Angular 5

I am having this same issue consistently in a prod environment using Angular 5 but It works completely fine locally! I installed using this command: npm install @auth0/angular-jwt

For a tl;dr - I was previously using Angular 4.4.6 with angular2-jwt, but now that http is deprecated, I am using HttpClient with this newer version of angular-jwt.

Here is what I have done: My app.module.ts looks as follows (showing both the inline function and a custom factory syntax that I tried)

// app.module.ts
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { JwtModule, JWT_OPTIONS } from '@auth0/angular-jwt';
import { TokenService } from './_services/token.service';

export function jwtOptionsFactory(tokenService) {
  return {
    tokenGetter: () => {
      return tokenService.get();
    },
    whitelistedDomains: ['budgetivity.com', 'budgetivity.local']
  };
}

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
	...
    HttpClientModule,
    JwtModule.forRoot({
      config: {
        tokenGetter: () => {
          return sessionStorage.getItem('token');
        },
        whitelistedDomains: ['budgetivity.com', 'budgetivity.local']
      }
      // jwtOptionsProvider: {
      //   provide: JWT_OPTIONS,
      //   useFactory: jwtOptionsFactory,
      //   deps: [TokenService]
      // }
    }),

I am using full IIS locally with my host file pointing to 127.0.0.1 for budgetivity.local

When I run locally, I am building for dev and I use the ng-build command and my environment.ts looks as follows:

export const environment = {
	...
  baseUrl: 'http://budgetivity.local',
	...
};

When I build for prod I use ng build --env=prod and my environment.prod.ts looks as follows:

export const environment = {
	...
  baseUrl: 'https://www.budgetivity.com',
	...
};

But - when running a ng-build --prod command I get an error if I am using the function syntax instead of the custom service syntax. “Error encountered resolving symbol values statically. Function calls are not supported.” So when using the ng-build --prod command I must switch the code to only use the custom service syntax.

When running locally, my requests are sucessfully sent to my local API and have an appropriate Authorization: Bearer XXXX (token) When built for and deployed to Prod, the requests do not have an Authorization header at all.

I have even built for dev but used the Prod baseUrl - when that is deployed to Prod that also does not send the Authorization header in any of the requests.

For sake of completeness here is my tokenService and a method that calls my API:

// token.service.ts
import { Injectable } from '@angular/core';

@Injectable()
export class TokenService {

  public get(): string {
    return sessionStorage.getItem('token');
  }

  public set(token: string): void {
    sessionStorage.setItem('token', token);
  }

  public deleteToken(): void {
    sessionStorage.removeItem('token');
  }
}

// session.service.ts
import { environment } from '../../environments/environment';
...
  public isSessionValid(): Observable<any> {
    return this.http.get(`${environment.baseUrl}/api/v1/sessions`)
      .catch((error: Response) => {
        return Observable.throw(error);
      });
  }

…

Here is what my local call looks like:

and here is what it looks like on Prod: