Confirmation of Microsoft Account deletion

Hello -

I deleted a PRIMARY Microsoft Account over a year ago, in hopes that I would be able to use that account as an alias on a different Microsoft Account. 

I was told that I would need to wait 365 days for the account to be deleted. It has been well over a year, but I still CANNOT add that email address as an alias to my current account.

Can somebody assist with this? I need to check on the status of my OLD account to confirm that it was indeed deleted.

Thanks,

Paul