In a large serving bowl whisk together poppy seed dressing, mayonnaise, apple cider vinegar and salt. Whisk until combined. Cover and place in fridge while you cook noodles.Boil noodles in a large pot of salted water until al dente; according to package directions. Once cooked drain water and rinse under cold water to cool down.Add noodles, chicken, grapes, almonds and green onion to dressing mixture in bowl. Fold to combine everything. Cover with plastic wrap or lid and chill in fridge for at least 2 hours or longer.Serve and enjoy!