Laravel 6多数据库身份验证问题

'connections' => [
    'mysql' => [
        'driver' => 'mysql',
        'host' => 'localhost',
        'port' => '3306',
        'database' => 'database1',
        'username' => 'username1',
        'password' => 'password1',
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],

    'mysql2' => [
        'driver' => 'mysql',
        'host' => 'localhost',
        'port' => '3306',
        'database' => 'database2',
        'username' => 'username2',
        'password' => 'password2',
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'strict' => true,
        'engine' => null,
    ],
],

// 使用默认的数据库连接进行身份验证
Auth::attempt($credentials);

// 使用指定的数据库连接进行身份验证
Auth::connection('mysql2')->attempt($credentials);