how can resolve error 404 to communicate my front and back angular symfony

I have manage proxy file in my front angular. I have two back-end symfony. the first back send me jwt and second other operation. Now my second back can communicate with my front but, my first back (jwt) do not receive request to get token.

This is my proxy :

 const PROXY_CONFIG = [
   {
     context: [
       '/auth/*/**'
     ],
     target: 'http://localhost:8088',
     secure: false,
     logLevel: 'debug',
     changeOrigin: true
   },
    {
        context: [
            '/api/*/**'
        ],
        target: 'http://fiberready',
        secure: false,
        logLevel: 'debug',
        changeOrigin: true
    },
    {
        context: [
            '/assets/env/env.json',
        ],
        target: 'http://127.0.0.1:4200/assets/env/env.local.json',
        secure: false,
        pathRewrite: {
            "^/assets/env/env.json": ""
        }
    }
];

module.exports = PROXY_CONFIG;

And here, my action :

const url = 'auth/token';

    //Headers
    const httpOptions = {
      headers: new HttpHeaders({
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'DELETE, POST, GET, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With',
        'Access-Control-Allow-Credentials': 'true',
        'Content-Type': 'application/json',
      })
    };

    //Query params d'un user
    params = ....

    return this.http.get<string>(url, {headers: httpOptions.headers, params: params }).pipe(

      tap((token: string) => {
        this.jwtToken.next({
          isAuthenticated: true,
          token: token,
        });
       
        localStorage.setItem('jwt', token);
      })
    );
  }

But i have error 404 : i don't understand why.

GEThttp://localhost:4200/auth/token
[HTTP/1.1 404 Not Found 4ms]