var response = _searchOrderService.SearchSubscriptions(request).ToList();

var customers = _customerService.ListCustomerByReseller(model.ResellerId);

List<MicrosoftCustomer> lista = new List<MicrosoftCustomer>();

foreach (var item in customers)
{
   lista.AddRange(ListaMicrosoftCustomer(item.CustomerMicrosoftId));
}

response.ForEach(x => x.MicrosoftDomain);