I have created five aliases in Outlook.com but I received only 4 confirmation messages from "Outlook.com Team" saying, "Your new Outlook.com alias is ready" (for the last 4 of these aliases only). As a result, the first alias I create appears added to my account, but until now it does not work (only 4 of 5 aliases works) and I can not send or receive messages through this first alias. 

What can I do to fix this?