In my Laravel-5.8 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'));
        }
    }   
}


'azure' => [
   'client_id' => env('AZURE_KEY','mykey'),
   'client_secret' => env('AZURE_SECRET','myazuresecret'),
   'redirect' => env('AZURE_REDIRECT_URI','https://myapp/login/azure/callback')
],

This is working and it uses: https://myapp.com

But I'm now asked to make it multi-company application using single DB. There is a company table and each table have company_id

Each having this url:

https://myapp.com   
https://company1.myapp.com
https://company2.myapp.com

I now have these tables:

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

From the company table, where subdomain is null then it is https://myapp.com , while subdomain field could be company1 or company2 and so on.

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

The question is on the azure url redirect:

'redirect' => env('AZURE_REDIRECT_URI','https://myapp/login/azure/callback')

since it is redirecting to the main domain myapp.

What effect will this have on company1.myapp.com and company2.myapp?

How do I make it redirect to the subdomains also?

Thanks