error status 401 error unauthenticated laravel passport

This is my first time implementing laravel passport

This is my config/auth.php

'guards' => [
    'web' => [
        'driver' => 'session',
        'provider' => 'users',
    ],

    'api' => [
        'driver' => 'passport',
        'provider' => 'users',
    ],
],

and this is where my routes/api.php that are guarded by auth:api

Route::group(['middleware' => ['auth:api']], function () {
    Route::resource('users','Users\AdminUsersController')->except([
    'create', 'edit'
    ]);
});

and this is how I fetch the api

fetchUsers: async function(page_url){
     await axios.get('api/users')
     .then( response => {
          vm.users = response.data.data;
      })
     .catch( error => {
          console.log(error);
      });
 },

Im getting status 401 error unauthenticated. How can I fix this? TIA

via Chebli Mohamed