Miscellaneous topics that do not fit into specific categories.
Hi. I'm Brian and I'll try to help.
Keep in mind that these are user forums. No one here has access to the Microsoft servers or any accounts other than our own.
If an alias that uses a Microsoft domain like @hotmail.com is removed from an account, that removal is immediate and permanent. That's why you receive the error that the account doesn't exist. However, Microsoft keeps track of all deleted aliases so they can't be reused. If you try to add it as an alias again, you'll get the error that the alias already exists. There is no way around this restriction.