I had two Outlook.com accounts and I have deleted one and have tried to add an alias that was attached to the deleted account to my other account, however when I do this I receive the following message:

This email address is already taken. Please try another one.

It is not, as I have already deleted the old account and can no longer log on to it.   I have waited several days to see if it would resolve itself but it hasn't.

Please let me know what I can do to resolve this issue?

Thanks, Kate