Not showing users data in Laravel App

working with Laravel 8 and fetch data using postman. I have following controller functions to show users data AuthController

public function index()
    {
        $users = User::all();
        
        return send_response('Success', $users);

    }

api

Route::middleware('auth:api')->group(function () {
        Route::get('/users', [AuthController::class, 'index']);
     });

but when I run following url on postman using GET method

http://localhost:8000/api/v1/users/

I got following message on postman

{
    "message": "Unauthorized"
}

how could I fix this problem?