Laravel basic auth not working in using jwt

I am using laravel 5.6. I tried to use JWT. That's why I made some modification followed by https://jwt-auth.readthedocs.io/en/develop/quick-start/ . Now jwt is working properly.I checked it by postman. But when I try to use laravel basic login with email and password it does not work. Thanks in advance

I also made change on

'defaults' => [
    'guard' => 'api',
    'passwords' => 'users',
],

...

'guards' => [
    'api' => [
        'driver' => 'jwt',
        'provider' => 'users',
    ],
], 

via Chebli Mohamed