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 those aliases only). As a result, the first alias I create appears added to my account (ok!), but until now it does not work .

Only 4 of 5 aliases I have created work and I can not send or receive messages through the first alias. 

What can I do to fix this?

(note: I do not have used 10 aliases limit...)