Laravel passport api returning a 401 unauthorised response

I am trying to get the details of user by passing the token stored in storage to a laravel passport api. Request works fine when I test with postman but requesting from the app, I keep getting 401 unauthorised. The app is with ionic 3 and angular 4. My laravel backend is already configured with Barryvdh Laravel CORS package and there are no problems with CORS. I have read nearly all similar problems with no answer.

Frontend

this.storage.get('token').then((value)=>{

    this.token = value;

    let headers = new HttpHeaders()
    .set('Content-Type','application/json')
    .set('Authorization',"Bearer "+this.token);;

    console.log(this.token);

    this.http.post(this.apiUrl+'/check-login-status',{headers:headers})

          .subscribe(res => {
            resolve(res);
          },(err) => {
            reject(err);

     });//end http post

});//end this.storage.get

Laravel routes/api.php

Route::group(['middleware' => 'auth:api'], function(){
    Route::post('/check-login-status', 'Mobile\Auth\LoginController@checkLoginStatus');
});

via Chebli Mohamed