Laravel Passport Does Not Authenticate User After Receiving Access Token

I’m using Laravel 10 and Laravel Passport and in this project, I tried registering new users like this:

public function register(Request $request)
    {
        $request->validate([
            'name' => 'required|max:255',
            'email' => 'required|unique:users|max:255',
            'password' => 'required|min:6'
        ]);

        $user = User::create([
            'name' => $request->name,
            'email' => $request->email,
            'password' => Hash::make($request->password)
        ]);

        $token = $user->createToken('MyApp')->accessToken;

        return response([
            'token' => $token
        ]);
    }

Then I defined another route which is under api middleware:

Route::post('register',[AuthenticationController::class,'register']);

Route::middleware('auth:api')->group(function() {
    Route::resource('products', ProductController::class);
});

And in the ProductController I tried adding this method for storing new products:

public function store(Request $request)
    {
        $request->validate([
            'title' => 'required|max:255',
            'description' => 'required|max:255',
            'price' => 'required'
        ]);

        if ($request->user()) {
            Product::create([
                'title' => $request->title,
                'description' => $request->description,
                'price' => $request->price,
                'user_id' => $request->user()->id
            ]);

            return response([
                'message' => 'product created successfully'
            ],201);
        }else{
            return response(['message' => 'User not authenticated.'], 401);
        }
    }

But when I test the url in PostMAN which is this:

http://localhost:8000/api/products

I get this message:

{
    "message": "Unauthenticated."
}

However I have copied and pasted the token retrieved from /register rendpoint as Token input of Authorization section:

I also set the Headers to Accept and application/json and sent these form-data as Body:

title:myproduct
description:The production desc
price:2000

I don’t know why I get this Unauthenticated Message, I also configured the auth.php like this:

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

And added this Service Provider to app.php:

LaravelPassportPassportServiceProvider::class,

And used the correct class at User Model:

use LaravelPassportHasApiTokens;

class User extends Authenticatable
{
    use HasApiTokens, HasFactory, Notifiable;
    ...
}

So what’s going wrong here? How can I solve this issue?

UPDATE #1:

Result of dd($user->createToken('MyApp'));: