Unable to enter previous Xbox account after creating alias and changing it and deleting...

I changed the email on my gamer tag by signing in to microsoft live account, creating a new alias and assigning it as the primary account, then deleting the old alias.

The link you posted describes how you change emails by adding an alias, then removing the previous email (alias) associated with the Xbox account (i.e. Microsoft account). The problem is I can't add the email I've just created because, upon realisation,
I have instead created a Microsoft account (and as such the email I entered is now the primary alias to said account), which is why I was thinking them as two separate things. I can't link an existing Microsoft account as an alias, and I can't use the email
for that new Microsoft account because it's already an alias. I think there should be clearer documentation about this because it is confusing. Ages ago, every new email you'd create was just that - an email. Nowadays though it's Microsoft accounts and aliases,
and linking emails with Microsoft accounts. Confusing stuff.

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello Manglebones, when it says you deleted your Microsoft that had main accoun, did you delete Alias and email or just Alias?

Because when we create an Alias you have the option to keep the previous email within the account and with that you can log into the account with one or the other, but if you created Alias and then deleted the system will not let you create an account with the email that existed previously.

Below I leave some links on Alias.

Add or remove an email alias in Outlook.com

https://support.microsoft.com/en-us/office/add-...

Change the email address or phone number for your Microsoft account

https://support.microsoft.com/en-us/account-bil...

Once you change your gamertag, it becomes available to the public and anybody may switch to that or create an account with your previous alias.

Unless you fully delete the email, the email used when creating an Xbox account will always be the email tied to that account. Changing your contact info or adding an alias does not change this.