How to link domain and sub-domain in Route with Azure Socialite Login

In my Laravel-5.8 application, I have a multi-company application using a single database without using package. Each table have a company_id derived from the company table as shown below:

id | company_name       |    subdomain
1  | Main               |
2  | Company1           |    company1
3  | Company2           |    company2

Main=>  localhost:8888/myapp
Company1=>localhost:8888/company1.myapp
Company2=>localhost:8888/company2.myapp

I have these models:

class Copmany extends Model
{
  protected $table = 'organizations';
  protected $fillable = [
     'id',
     'company_name',
     'subdomain',   
 ];
}

class User extends Authenticatable
{
    protected $fillable = [
        'name', 
        'username',
        'email', 
        'password', 
        'company_id', 
    ]; 

    public function company()
    {
        return $this->belongsTo('App\Models\Company');
    }
}

Also I am using Azure Socialite Login.

class LoginController extends Controller
{
    use AuthenticatesUsers;
    protected $redirectTo = '/dashboard';
    protected $username = 'username';

    public function redirectToProvider()
    {
        return Socialite::with('azure')->redirect();
    }

    public function handleProviderCallback()
    {
         $azureUser = Socialite::with('azure')->user();
        try 
        {
            $user = User::where('email', $azureUser->email)->orWhere('username', $azureUser->user['mailNickname'])->first();
            if($user)
            {
                if(Auth::loginUsingId($user->id))
                {
                    $user->update([
                         'last_login_at' => now(),
                    ]);
                   return redirect()->intended('/dashboard');
                }
            }
        } 
        catch(\Exception $e) 
        {
            session()->flash("error", "Authentication failed, kindly contact the Administrator!");
            return redirect(route('login'));
        }
    }   
}

I created a middleware:

class VerifyDomain
{
 public function handle($request, Closure $next)
 {
    $domain == "myapp"; // your company app name
    $path = $request->getPathInfo(); // should return /company1.myapp or /company2.myapp or /myapp 
    if (strpos($path, ".") !== false) { // if path has dot.
        list($subdomain, $main) = explode('.', $path);
        if(strcmp($domain, $main) !== 0){
            abort(404); // if domain is not myapp then throw 404 page error
        }
    } else{
        if(strcmp($domain, $path) !== 0){
            abort(404); // if domain is not myapp then throw 404 page error
        }
        $subdomain = ""; // considering for main domain value is empty string.
    }

    $company = Company::where('subdomain', $subdomain)->firstOrFail(); // if not found then will throw 404

    $request->session()->put('subdomain', $company); //store it in session

    return $next($request);
 }
}

Already, I have two (2) route groups in the route/web.php wgich looks like this:

Route::get('/', ['as' => '/', 'uses' => 'IndexController@getLogin']);

Auth::routes();
Route::get('/dashboard', 'HomeController@index')->name('dashboard');

  // Config Module
  Route::group(['prefix' => 'config', 'as' => 'config.', 'namespace' => 'Config', 'middleware' => ['auth']], function () {
    Route::resource('countries', 'ConfigCountriesController');
    Route::resource('nationalities', 'ConfigNationalitiesController');
});

 // HR Module
  Route::group(['prefix' => 'hr', 'as' => 'hr.', 'namespace' => 'Hr', 'middleware' => ['auth']], function () { 
    Route::resource('designations', 'HrDesignationsController');
    Route::resource('departments', 'HrDepartmentsController');  
    Route::resource('employee_categories', 'HrEmployeeCategoriesController');

});

A user can exit in more that one organization.

When a user logins in with azure socialite, I want the application to check the domain and sub-domain route and use it to get the company_id, then map it with the company_id in the user tables.

For instance, if user logs in using localhost:8888/myapp, the application use it to get the company_id in the user table, and if it is localhost:8888/company1.myapp, it does likewise and so on.

The user should only see the profile based on his company. Also should only see it's company data.

How do I achieve this from the route and LoginController?