Laravel 9: Auth::user() / auth()->user() null after successfull login - laravel

Question

I made a manual login system in a Laravel 9 API that it's works correctly, but when I try to use Auth::user() in another controller, I get it as null, but when I return the auth->user() to the Vue SPA, I get it correctly. Is there a way to it is setting Auth::user() null after a successfull login? Here's are my api.php (api routes):
route::middleware('auth:sanctum')->get('/user', function (Request $request) {
return $request->user();
});
route::controller(UserController::class)->group(function () {
route::post('/register', 'register');
route::post('/login', 'login');
route::get('/logout', 'logout');
});
route::resource('book', BookController::class);
route::get('/my_books/{user_id}', [BookController::class, 'myBooks']);
As you can see in the image above, I can get the authenticated user after try login it, here's my login method:
public function login(Request $request)
{
$validate = $request->validate([
'email' => 'required|email',
'password' => 'required'
]);
if ($validate) {
$credentials = $request->only('email', 'password');
return Auth::attempt($credentials)
? Auth::user() :
response()->json('No se ha podido iniciar sesión', 500);
}
return response()->json($validate->errors, 422);
}
But when I'm going to store a new book, I get the following error:
Here's the error, when I try to use the auth()->user() method to get the logged in user's id:
public function store(Request $request)
{
$validate = $request->validate([
'title' => 'required',
'genre' => 'required'
]);
if ($validate) {
$book = Book::create([
'title' => $request->title,
'author' => $request->author,
'genre' => $request->genre,
'subgenre' => $request->subgenre,
'opinion' => $request->opinion,
]);
$user = User::find(auth()->user()->id);
if ($request->cover) {
$this->uploadImage($request, 'cover', $book);
}
$user->books()->save($book);
return new BooksResource($book);
}
I don't know why it's happening, and I'd like any idea or possible solution. Thanks in advance:

Answer 1

From laravel 9 documentation
// Get the currently authenticated user's ID...
$id = Auth::id();
Also, you should describe your
route::get('/my_books/{user_id}', [BookController::class, 'myBooks']);
route before resource route.
I guess, you dont need this assign $user = User::find(auth()->user()->id); just use auth()->user

Answer 2

To get the Authenticated user, put the book route inside the auth:sanctum middleware.