Why cannot i get the access token using in laravel passport

I am new to Laravel Passport. I am requesting the access token and it seems to work all fine.

     
    
        $params = [
            'grant_type' => 'password',
            'client_id' => $this->client->id,
            'client_secret' => $this->client->secret,
            'username' => $request->email,
            'password' => $request->password,
            'scope' => '*'
        ];

        $request->request->add($params);

        $proxy = Request::create('/oauth/token', 'POST');
        $accessToken = Route::dispatch($proxy);
    return $accessToken;

But I also want to use get the authenticated user with the response so I do something like this

     $proxy = Request::create('/oauth/token', 'POST');
        $accessToken = Route::dispatch($proxy);
         return [
             'access_token' => $accessToken,
             'auth_user' => auth()->user()
        ];

But the above code fails. In postman i get the following response that does not makes any sense to me

    {
    "access_token": {
        "headers": {},
        "original": {},
        "exception": null
    },
    "auth_user": null
}

How do I get the authenticated user along with the access token