Alias email not recieving Emails

I recently changed my primary email on Microsoft and removed the old primary, i later realized i had some accounts associated with this old email, now i need to reset a password on that other account so i added that old email back as a alias but its been weeks now and i still im not receiving emails sent to that alias i even tried sending some myself from a Gmail and it sends properly but my outlook doesn't receive it. anyone know where i can go to fix this