Problemas na autenticação de login Angular + JWT

import { Router } from '@angular/router';
import { environment } from 'src/environments/environment';
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import jwtDecode from 'jwt-decode';

@Injectable({
    providedIn: 'root'
})
export class LoginService {

    url = `${environment.API}/api/login`;
    private urlRefreshToken = `${environment.API}/private/refresh_token`;

    constructor(private http: HttpClient, private router: Router) { }

    async login(user: any) {

        const result = await this.http.post<any>(this.url, user, {
          observe: 'response',
        }).toPromise();

        const token = result!.headers.get('Authorization');

        if (token) {
          window.localStorage.setItem('token', token);
          return result;
        }

        return false;
      }

      getAuthorizationToken() {
        return window.localStorage.getItem('token');
      }

      isTokenExpired(token?: string): boolean {
        if (!token) {
          return true;
        }

        const date = this.getTokenExpirationDate(token);
        if (date === undefined) {
          return false;
        }

        return !(date.valueOf() > new Date().valueOf());
      }

      isUserLoggedIn() {
        const token = this.getAuthorizationToken();

        if (!token) {
          return false;
        } else if (this.isTokenExpired(token)) {
          return false;
        }

        return true;
      }

      getTokenExpirationDate(token: string): Date {
        try {

          const decoded: any = jwtDecode(token);

          if (decoded.exp === undefined) {
            return null
          }

          const date = new Date(0);
          date.setUTCSeconds(decoded.exp);
          return date;

        } catch (error) {
          console.error(error);
          window.localStorage.removeItem('token');
          this.router.navigate(['']);
        }

        return null;
      }

      async refreshToken() {

        if (!this.isUserLoggedIn()) {
          return false;
        }

        const result = await this.http.post(this.urlRefreshToken, null, {
          observe: 'response',
        }).toPromise();

        const token = result.headers.get('Authorization');

        if (token) {
          window.localStorage.setItem('token', token);
          return result;
        }

        return false;
      }

}