laravel10 使用passport 密码授权令牌无法使用，报错unsupported_grant_type

1. 运行环境

本地运行windows
php版本8.1.23
laravel10.*

1). 当前使用的 Laravel 版本？

3). 当前系统

windows10

2. 问题描述？

使用passport 密码授权的时候无法获取token
报错

我的安装步骤如下：

composer create-project --prefer-dist laravel/laravel=10.* laravel

.env 数据库配置
修改数据库默认字符串长度
   Schema::defaultStringLength(191);
composer require laravel/passport
Laravel\Passport\HasApiTokens Trait 添加到 App\User 模型中 // 提供一些辅助函数检查已认证用户的令牌和使用范围
修改config/auth.php文件
'api' => [
    'driver' => 'passport',
    'provider' => 'users',
    'hash' => false,
],

php artisan migrate
php artisan passport:：install 
生成两个数据

这是api.php的路由
Route::post('/register', [PassportController::class, 'register']);

这是控制器代码

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Cache;
use App\Models\User;
use Illuminate\Support\Facades\Hash;
use GuzzleHttp\Exception\RequestException;

class PassportController extends Controller
{ 
    protected $redirectTo = '/home';
    protected $client_id ;
    protected $client_secret ;
    public function __construct()
    {
        // $this->middleware('auth:api', ['except' => ['login','register','refresh']]);

        $client = Cache::remember('passport_client',60*5, function () {
            return DB::table('oauth_clients')->where('password_client',1)->first();
        });

        $this->client_id = $client->id;
        $this->client_secret = $client->secret;


    }

    public function register(Request $request){

        // $this->validator($request->all())->validate();
        // dd(1);
        // $this->create($request->all());
        return $this->getToken();
    }



    protected function create(array $data)
    {    //dd(12);
        // $password = password_hash($data['password']);
        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
        ]);
    }

    protected function getToken()
    {  
        $http = new \GuzzleHttp\Client;
        try {

            $response=   $http->post('http://www.tt.com/oauth/token', [
                'form_params' => [
                    'grant_type' => 'password',
                    'client_id' => $this->client_id,
                    'client_secret' => $this->client_secret,
                    'username' => '123@123.com',
                    'password' => '123456',
                    'scope' => '',
                ],

                'headers'=>[
                    'Accept'=>'application/json',
                ],
                // 'verify'=>false,

                'http_errors'=>true,
            ]);

            return json_decode((string) $response->getBody(), true);
        }catch(RequestException $e)
        {
            $response = $e->getResponse();
            $message = $e->getMessage();
            dd($response,$message);
        }

    }

}

看了很多版本的passport 关于password认证的，也尝试过很多次了，但是就是不行，已经快疯了，求各位大佬不吝赐教